The passage of 1 mol H2 requires 2 Faradays.
The balanced equation for the electrolysis of water is:
2H2O → 2H2 + O2
For every mole of H2 produced, two moles of electrons are needed to reduce the two protons in each H2O molecule to H2 gas. One Faraday is equal to the amount of electrical charge (i.e., the number of electrons) needed to reduce or oxidize one mole of a substance during an electrolytic reaction. Therefore, for the reduction of one mole of H2O to produce one mole of H2, two Faradays are required.
To find out how many Faradays are required for the passage of 1 mol H2, we'll use the following terms and concepts:
1. Mole (mol): A unit of measurement for the amount of substance, equal to 6.022 x 10^23 particles (Avogadro's number).
2. Hydrogen (H2): A diatomic molecule composed of two hydrogen atoms.
3. Faraday: A unit of electric charge, equal to the charge of 1 mole of electrons, approximately 96,485 Coulombs.
Now let's calculate how many Faradays are needed:
Step 1: Determine the moles of electrons involved in the reaction.
For the formation of H2, the balanced half-reaction is: 2H+ + 2e- → H2
This means that for every 1 mol of H2, 2 moles of electrons (2e-) are involved in the reaction.
Step 2: Calculate the required Faradays.
1 mol of electrons = 1 Faraday (96,485 Coulombs)
So, for 2 moles of electrons, we need 2 Faradays.
Therefore, the passage of 1 mol H2 requires 2 Faradays.
For more such questions on Faradays , Visit:
https://brainly.com/question/31604460
#SPJ11
1 mol H2 requires passage of 2 Faradays.
1. According to Faraday's law of electrolysis, the amount of substance produced or consumed at an electrode during electrolysis is proportional to the charge passed through the cell.
2. For the production of 1 mol H2, we must consider the balanced half-reaction for the reduction of hydrogen ions to form hydrogen gas: 2H+ + 2e- → H2
3. From this half-reaction, we see that 2 moles of electrons (2e-) are required to produce 1 mol of hydrogen gas (H2).
4. Since 1 Faraday is equal to the charge of 1 mole of electrons (approximately 96,485 C/mol), we can conclude that 1 mol H2 requires the passage of 2 Faradays, as 2 moles of electrons are needed for the production of 1 mol H2.
To know more about Faraday's law of electrolysis click here:
https://brainly.com/question/17012638
#SPJ11
A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. What is the [H ] (molarity) before any base is added
0.723 is the [H ] (molarity) before any base is added.
the balanced equation for the acid-base reaction is
KOH + HClO₄ ---> KClO₄ + H₂O
stoichiometry of KOH to HClO₄ is 1:1
The number of HClO₄ moles - 0.723 M / 1000 mL/L x 25.0 mL = 0.0181 mol
Number of KOH moles - 0.27 M/ 1000 mL/L x 80.0 mL = 0.0216 mol
KOH is a strong acid and HClO₄ is a strong base therefore complete dissociation takes place.
the acid reacts with base in a 1:1 molar ratio, there's excess base remaining.
excess OH⁻ ions - 0.0216 - 0.0181 = 0.0035 mol
concentration is calculated as the number of moles/volume
volume of solution - 25.0 + 80.0 = 105.0 mL
[OH⁻] = 0.0035 mol / 0.105 L = 0.033 M
pOH = -log [OH⁻]
pOH = -log(0.033 M)
pOH = 1.48
pH can be calculated by knowing the pOH
pH + pOH = 14
pH = 14 - 1.48 = 12.52
pH = -log [H₃O⁺]
[H₃O⁺] = antilog(-12.52)
[H₃O⁺] = 3.0 x 10⁻¹³ M
0.723 is the [H ] (molarity) before any base is added.
To know more about molarity refer to: https://brainly.com/question/8732513
#SPJ1
Calculate the number of molecules in 3 mol of carbon dioxide (CO2).
18.06 ₓ [tex]10^{23}[/tex] molecules in 3 mol of carbon dioxide (CO2).
What is Avogadro's number?The proportionality factor that connects the quantity of substance in a sample to the number of constituent particles in that sample is called the Avogadro constant. The reciprocal mole, which is its SI unit, is specified precisely as NA 6.02214076 × [tex]10^{23}[/tex] [tex]mol^{-1}[/tex]. It bears Amedeo Avogadro's name, an Italian scientist.
When dealing with very big quantities, chemistry uses Avogadro's number. It serves as the foundation for the mole, a unit of measurement that makes converting between moles, mass, and the number of molecules simple. The quantity, for instance, can be used to determine how many water molecules make up a single snowflake.
1 Mole is 6.02ₓ [tex]10^{23}[/tex] molecules.
Therefore 3 Moles of Carbon Dioxide ([tex]CO_{2}[/tex]) =3(6.02ₓ [tex]10^{23}[/tex])
3 Moles of Carbon Dioxide ([tex]CO_{2}[/tex]) =18.06 ₓ [tex]10^{23}[/tex]molecules of [tex]CO_{2}[/tex].
To know more about Avogadro constant refer to: https://brainly.com/question/14637684
#SPJ1
Hydrocarbons (typically petroleum products), which separate in water and have a Specific Gravity less than one, represents a significant hazard to firefighters. Why
Hydrocarbons (typically petroleum products), which separate in water and have a Specific Gravity of less than one, represent a significant hazard to firefighters. Why?
In water, hydrocarbons float to the surface. Water has limited impact on Class B Flammable Liquids and Gases fires, unless water is used to supply a Class B foam/water mixture that can slow the spread of flammable vapors and allow extinguishment by excluding oxygen. Hydrocarbons emit flammable vapors with a significant risk of fire.Describe hydrocarbons.Any member of the class of organic chemical compounds known as hydrocarbons only includes the atoms carbon (C) and hydrogen (H). The hydrogen atoms bond to the carbon atoms in a variety of ways to create the compound's structural framework.
What percentage of crude oil is made up of hydrocarbons?Although there could be thousands of different hydrocarbon molecules in a given crude oil, these descriptions only focus on the type of hydrocarbon that predominates in the combination. Typically, each sort of molecule can be found in all naturally occurring crude oils.
Learn more about Hydrocarbons here:-
https://brainly.com/question/11162848
#SPJ4
Suppose 110.0 mL110.0 mL of hydrogen gas at STP combines with a stoichiometric amount of fluorine gas and the resulting hydrogen fluoride dissolves in water to form 150.0 mL150.0 mL of an aqueous solution. What is the concentration of the resulting hydrofluoric acid
Suppose 110.0 mL of hydrogen gas at STP combines with a stoichiometric amount of fluorine gas and the resulting hydrogen fluoride dissolves in water to form 150.0 mL of an aqueous solution. 0.032 M is the concentration of the resulting hydrofluoric acid.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now write the balanced chemical equation
H₂ + F₂ → 2HF
What is Ideal Gas ?An ideal gas is a gas that obey gas laws at all temperature and pressure conditions. It have velocity and mass but do not have volume. Ideal gas is also called perfect gas. Ideal gas is a hypothetical gas.
It is expressed as:
PV = nRT
where,
P = Pressure
V = Volume
n = number of moles
R = Ideal gas constant
T = temperature
Here,
P = 1 atm [At STP]
V = 110 ml = 0.11 L
T = 273 K [At STP]
R = 0.0821 [Ideal gas constant]
Now put the values in above expression
PV = nRT
1 atm × 0.11 L = n × 0.0821 L.atm/ K. mol × 273 K
[tex]n = \frac{1\ \text{atm} \times 0.11\ L}{0.0821\ \text{L. atm/ K. mol} \times 273\ K}[/tex]
n = 0.0049 mol
How to find the concentration of resulting solution ?To calculate the concentration of resulting solution use the expression
[tex]C = \frac{n}{V}[/tex]
[tex]= \frac{0.0049}{0.15}[/tex]
= 0.032 M
Thus from the above conclusion we can say that Suppose 110.0 mL of hydrogen gas at STP combines with a stoichiometric amount of fluorine gas and the resulting hydrogen fluoride dissolves in water to form 150.0 mL of an aqueous solution. 0.032 M is the concentration of the resulting hydrofluoric acid.
Learn more about the Ideal Gas here: https://brainly.com/question/25290815
#SPJ4
You picked up a dirty test tube with a sticky substance on the outside. You get some of this substance on your hand. What is the first thing you should do
You picked up a dirty test tube with a sticky substance on the outside. You get some of this substance on your hand. The first thing that I should do is wash my hand and then tell the teacher.
Define the test tube.A test tube often referred to as a culture tube or sample tube, is a typical item of lab glassware that is made up of a finger-like length of clear plastic or glass tubing that is open at the top and closed at the bottom. Usually, test tubes are stored on dedicated racks.
Learn more about Test Tube here:-
https://brainly.com/question/26703433
#SPJ4
Which best describes the oxidizing agent in this reaction?
Cl2(aq) + 2Br–(aq) Right arrow. 2Cl–(aq) + Br2(aq)
Bromine (Br) is the oxidizing agent because it gains an electron.
Bromine (Br) is the oxidizing agent because it loses an electron.
Chlorine (Cl) is the oxidizing agent because it gains an electron.
Chlorine (Cl) is the oxidizing agent because it loses an electron.
Answer:
» Chlorine (Cl) is the oxidizing agent because it gains an electron.
Explanation:
Oxidization is the process of losing electrons during an ionic reaction.
In the reaction above, aqueous chlorine captures the electrons of bromide ion hence becoming oxidized. In this sense, since aqueous chlorine is the one gaining electrons, it oxidizes bromide to bromine
[tex]{ \rm{Cl _{2(aq)}+ 2Br {}^{ - } _{(aq)} \dashrightarrow 2Cl {}^{ - } _{(aq)} + Br _{2( aq)}}}[/tex]
Answer:
c
Explanation:
edge 2022
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is _____.
Metal which produces hydrogen gas:
Aluminum metal produces hydrogen gas with dilute hydrochloric acid as well as sodium hydroxide.
What are amphoteric oxides?
Amphoteric oxides are the metal oxides which reacts with both acids and bases.
Some metals are also amphoteric, ie. on reaction with acid or base, the product will be salt and Hydrogen gas.
Amphoteric metal + acid/base → salt + hydrogen gas
Few metals of the periodic table are amphoteric in nature. Like Aluminum, Zinc etc.
Reactions:
Reaction with dilute NaOH:
2Al + 2NaOH + 2[tex]H_{2}[/tex]O → 2NaAl[tex]O_{2}[/tex] + [tex]H_{2}[/tex]
Reaction with dilute HCl:
2Al + 6HCl(aq) → 2Al[tex]Cl_{3}[/tex] + 3[tex]H_{2}[/tex]
Dilute and Aqueous (aq) means mixed with water ([tex]H_2O[/tex])
These reaction are balanced in order to follow the Law of conservation of mass.
Learn more about balanced reactions here,
https://brainly.com/question/14263388
#SPJ4
State whether it would be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions and explain why?.
Yes, it will be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions because it is negative.
What is a Catalyst?This is a substance which speeds up the rate of a chemical reaction by lowering the activation energy.
ΔG being negative indicates a a slow reaction which is why a catalyst under standard conditions should be used.
Read more about Catalyst here https://brainly.com/question/12507566
#SPJ1
What type of cleaning agent should be used to clean a laminar flow hood?
a. 70% Isopropyl Alcohol.
b. 90% Ethyl Propyl alcohol.
c. 90% Isopropyl Alcohol.
d. 50% Ethyl Propyl alcohol.
The type of cleaning agent that should be used to clean a laminar flow hood is 70% Isopropyl Alcohol.
Isopropyl alcohol is mixed with water for use as a rubbing-alcohol antiseptic. It is also utilized in aftershave creams, hand lotions, and other cosmetics. In enterprise, it is used as a less expensive solvent for cosmetics, drugs, shellacs, and gums, in addition to denaturing ethanol (ethyl alcohol).
Isopropyl alcohol is a colorless, flammable chemical compound with a robust alcoholic smell. As an isopropyl institution related to a hydroxyl group, it's far the handiest example of a secondary alcohol, wherein the alcohol carbon atom is connected to 2 other carbon atoms.
Isopropyl alcohol is pure alcohol and is a colorless liquid with a musty, sharp odor. There are no other components in a bottle of isopropyl alcohol. through assessment, rubbing alcohol consists of isopropyl alcohol among different components, including water. maximum rubbing alcohol manufacturers incorporate 70% isopropyl alcohol.
Learn more about isopropyl alcohol here https://brainly.com/question/5425836
#SPJ4
A lighter like the one shown below uses a substance called butane as its fuel. The butane can be burned to create a flame at the tip of the lighter.
a butane lighter
A teacher shows some of her students that the fuel inside the lighter's fuel tank is a liquid. But when she pushes the button that lets the fuel out of the lighter, they observe that it comes out as a gas. She and her students decide to investigate to discover what makes the butane change from a liquid to a gas.
Which step of an investigation would best help them determine what causes the change of state?
A.
calculating the volume of the lighter's fuel tank
B.
comparing lighters that use different kinds of fuel
C.
measuring the pressure inside the lighter's fuel tank
D.
heating butane gas to see if it changes state
Part of the investigation must be measuring the pressure inside the lighter fuel tank.
What is the pressure of a gas?The pressure of gas measures how compact the gas molecules are. We know that the more compacted the gas molecules are, the more likely the gas will exist in the liquid state.
Hence, part of the investigation must be measuring the pressure inside the lighter fuel tank.
Learn more about pressure of a gas:https://brainly.com/question/356658
#SPJ1
JUST TO BE CLEAR, I DON'T NEED THE ANSWER TO THIS QUESTION, BUT I REALIZED THAT NO ONE HAS ASKED THIS QUESTION SO I'M ASKING AND ANSWERING MY OWN QUESTION! This is in regards to a lab that deals w/ "Absorption and Radiation by Land and water" where you identify variables in the effect of type of material on Absorption experiment!
Question: Answer the questions using the drop-down menus.
Which is the independent variable in this experiment?
Answer: type of material
Which is the dependent variable in this experiment?
Answer: temperature of material
Which is a controlled variable in this experiment?
Answer: amount of heat materials received
And IK these are the right answers because I just took the test on Edge, and these answers are right.
Based on the type of experiment that is being conducted:
The independent variable is: type of materialsThe dependent variable is: temperature of materialThe controlled variable is the amount of heat materialWhat is an independent variable?This is the term that is used to refer to the variable that is used to arrive at conclusions about the dependent variable.
The experiment is trying to tell us that the temperature of a material is the function of the heat applied to it and the type of material.
The dependent variableThis is the term that is used to refer to the variable of interest. It is what is being tested in the experiment.
Read more on dependent and independent variables here:
https://brainly.com/question/25223322
#SPJ1
Find the empirical formula for a compound consisting of 63% MN and 37% O.
Answer:
Mn₁O₂
Explanation:
To find the empirical formula, you need to (1) determine how many grams of each element are within the compound, then (2) convert grams to moles (via the atomic masses of each element), and then (3) determine the mole-to-mole ratio of each element.
(Step 1)
Because the percents add to equal 100%, we can say that each percent is the mass of each element.
63% Mn ----> 63 grams Mn
37% O ----> 37 grams O
(Step 2)
We need to convert each mass to moles using the atomic masses. The atomic masses are a ratio comparing the mass of each element per every 1 mole.
Atomic Mass (Mn): 54.983 g/mol
Atomic Mass (O): 15.998 g/mol
63 grams Mn 1 mole
---------------------- x ------------------------- = 1.15 moles Mn
54.983 grams
37 grams O 1 mole
-------------------- x ------------------------ = 2.31 moles O
15.998 grams
(Step 3)
You can find the mole-to-mole ratio of each element in the compound by dividing the calculated mole values by the smallest mole value. In this case, since 1.15 moles was the smallest value calculated, it should be the divisor. The resulting amounts are the subscripts within the empirical formula.
1.15 moles Mn / 1.15 moles = 1 moles Mn
2.31 moles O / 1.15 moles = 2 moles O
Ratio of MnO = 1:2
This make the empirical formula: Mn₁O₂
chemical engineer has determined by measurements that there are moles of nickel in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample
A chemical engineer has determined by measurements that there are 7.0 moles of carbon in a sample of nickel tetracarbonyl. 7 moles of oxygen are in the sample.
What is Stoichiometry ?Stoichiometry helps us use the balanced chemical equation to measure quantitative relationships and it is to calculate the amounts of products and reactants that are given in a reaction.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
According to Stoichiometry
[tex]7\ \text{mol C} \times \frac{1\ \text{mol O}}{1\ \text{mol C}}[/tex]
= 7 mol O
Thus from the above conclusion we can say that A chemical engineer has determined by measurements that there are 7.0 moles of carbon in a sample of nickel tetracarbonyl. 7 moles of oxygen are in the sample.
Learn more about the Stoichiometry here: https://brainly.com/question/16060223
#SPJ4
Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: This is the chemical formula for Nickel Tetracarbonyl (a powerfully poisonous liquid used in Nickel Refining).
Ni(CO)₄
A chemical engineer has determined by measurements that there are 7.0 moles of carbon in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample ?
Write the empirical formula for at least four ionic compounds that could be formed from the following ions
Answer:
FeCO₃, Fe(IO₃)₂, Pb(CO₃)₂, Pb(IO₃)₄
Explanation:
Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.
1.) FeCO₃
-----> Fe²⁺ and CO₃²⁻
-----> +2 + (-2) = 0
2.) Fe(IO₃)₂
-----> Fe²⁺ and IO₃⁻
-----> +2 + (-1) + (-1) = 0
3.) Pb(CO₃)₂
-----> Pb⁴⁺ and CO₃²⁻
-----> +4 + (-2) + (-2) = 0
4.) Pb(IO₃)₄
-----> Pb⁴⁺ and IO₃⁻
-----> +4 + (-1) + (-1) + (-1) + (-1) = 0
[tex]\rm FeCO_3, Fe(IO_3)_2, Pb(CO_3)_2, Pb(IO_3)_4[/tex] are the empirical formula for at least four ionic compounds that could be formed from the given ions.
Ions, which are atoms or molecules with one or more lost or acquired electrons and an electric charge, are bonded together to create ionic compounds, a particular class of chemical complex. A metal cation (a positively charged ion) and a non-metal anion (a negatively charged ion) typically make up these compounds. Ionic bonding is a process that leads to the synthesis of ionic compounds. A non-metal atom becomes a negatively charged anion when it gets one or more electrons, while a metal atom becomes a positively charged cation when it loses one or more electrons.
To know more about ionic compounds, here:
https://brainly.com/question/30420333
#SPJ7
If a reaction occurs, what will be the products of the unbalanced reaction below?Zn(s) + HCl(aq) -->
A. No reaction will occur
B. ZnH(s) + Cl2(g)
C. ZnCl2(s) + H2(g)
D. HZnCl(s)
The products will be [tex]ZnCl_2(s) + H_2(g)[/tex]
Chemical reactionsZn is higher than hydrogen in the reactivity series. Thus, it will be able to displace hydrogen from the acid.
The equation of the reaction becomes: [tex]Zn(s) + HCl(aq) -- > ZnCl_2 (s) + H_2 (g)[/tex]
Hydrogen gas is released as a result. In fact, it is one of the ways of preparing hydrogen gas in the laboratory.
More on chemical reactivity can be found here: https://brainly.com/question/9621716
#SPJ1
point
Which is the correct balanced equation for copper(II) sulfate + aluminium -->
aluminium sulfate + solid copper?
Answer: 2Al(s) + 3CuSO4(aq) → Al2(SO4)3(aq) + 3Cu(s)
Explanation: The quantities of aluminum and copper sulfate used as reactants will be such that the copper sulfate will be in excess. Thus, the aluminum will be the limiting factor in determining the number of moles (gram-atoms) of products that will be formed.
Explain one way that God showed precision in his creation. (use complete sentences)
One way in which God showed precision in his creation was his mighty love on the he has on his creation
The book of John made us to know that: For God do love the world that he gave his only begotten son that whosoever believeth in him shall not perish but have everlasting life.
What is creation?Creations is the art of producing or making something out of something
So therefore, one way in which God showed precision in his creation was his mighty love on the he has on his creation
Learn more about God's creation:
https://brainly.com/question/14833222
#SPJ1
A compound has an empirical formula of CH₂O. What is its molecular formula, if its molecular mass is 90 g/mol?
(C=12.01 amu, H=1.008 amu, O=16.00 amu)
A: C3H6O3
B: C9H1809
i need help asap, will give brainliest and 50 points, as this is on my final :)
Empirical formula mass
[tex]\\ \tt{:}\dashrightarrow 12+2+16[/tex]
[tex]\\ \tt{:}\dashrightarrow 30g/mol[/tex]
n:-
[tex]\\ \tt{:}\dashrightarrow \dfrac{Molecular\:mass}{Empirical\:mass}[/tex]
[tex]\\ \tt{:}\dashrightarrow \dfrac{90}{30}[/tex]
[tex]\\ \tt{:}\dashrightarrow 3[/tex]
Molecular formula
[tex]\\ \tt{:}\dashrightarrow n\times Empirical\: formula [/tex]
[tex]\\ \tt{:}\dashrightarrow 3(CH_2O)[/tex]
[tex]\\ \tt{:}\dashrightarrow C_3H_6O_3[/tex]
To make a solution of lemonade, lemon juice and sugar are dissolved in water. the water is the ______ in this example.
To make a solution of lemonade, lemon juice and sugar are dissolved in water. the water is the Solvent in this example.
Solvent Examples. Common examples of solvents consist of water, ethanol, methanol, and acetone. The term 'solvent' may be defined as a substance that has the ability to dissolve a given solute to form a solution with it.
Solvents are substances that are used to dissolve the solutes used in the formulation. These solutes can be solids, liquids, or gaseous in nature. Thus solvents are used to get a solution upon interacting the solute with a suitable solvent.
Solvents are usually, however not usually, liquids. They can also be gases or solids. The material dissolved in the solvent is referred to as the solute. collectively, the solvent and solute comprise the solution.
Learn more about Solvent here https://brainly.com/question/25326161
#SPJ4
Crude petroleum is a mixture of many different components. How might one separate out the components to begin the process of refining petroleum
Fractional distillation is used for the refining of crude petroleum.
How are the components of crude petroleum separated out?Fractional distillation is the procedure used to separate crude oil's numerous constituents.
A mixture is divided into several components, known as fractions, using fractional distillation.A combination of hydrocarbons makes up crude oil. The crude oil evaporates, and in the fractionating column, its vapors condense at various temperatures.The hydrocarbon molecules in each percent have a comparable number of carbon atoms and a comparable range of boiling points.The mixture is placed above a tall fractionating column that has multiple condensers coming off at various heights.The bottom of the column is warm, while the top is cool. High boiling point compounds condense at the bottom, whereas low boiling point substances condense as they ascend.Learn more about fractional distillation here:
https://brainly.com/question/15187318
#SPJ4
Consider the balanced equation below.
N2H4 + 2H2O2 Right arrow. N2 + 4H2O
What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water?
1:2 and 1:4
1:3 and 1:4
1:2 and 3:5
1:3 and 3:5
Answer:
Explanation: The reaction between hydrazine and hydrogen peroxide yields nitrogen and water. The balanced chemical reaction is:
N2H4 + 2H2O2 N2 + 4H2O
which means that the mole ratio between hydrazine and hydrogen peroxide is 1:2 and the mole ratio between hydrazine and water is 1:4.
A solution contains 7.8% W/V ethanol. Express this in units of g/mL.
A solution that contains 7.8% W/V ethanol is equivalent to 0.078g/mL. Details about weights per volume can be found below.
How to convert W/V% to g/mL?Weights per volume is a unit for measuring density of a substance. It can be converted to g/mL using the following expression:
w/v% = g/100mL
According to this question, a solution contains 7.8% W/V ethanol. The equivalent of this in g/mL is as follows:
7.8% W/V = 7.8g/100mL
= 0.078g/mL
Therefore, a solution that contains 7.8% W/V ethanol is equivalent to 0.078g/mL.
Learn more about weights per volume at: https://brainly.com/question/2416510
#SPJ1
Explain why all the elements of period 3 is placed on the periodic table in period 3
Answer:
3 Electron shell/orbit
Explanation:
the number of shell an element has is what determines the period of that element.
What is the total pressure of a mixture of he and h2 if the partial pressures are 320 mm hg and 800 mm hg respectively
Answer:
1120 mm Hg
plus give brainliest
What is the balanced chemical reaction for Mg+H2=MgH, K+O2= KO, K+S= KS, Ba + Br2= BaBr, Ca + N2= CaN
(Giving brainliest for the answer that shows work) Please and thank you!
Answer:
1.) 2 Mg + H₂ ------> 2 MgH
2.) 2 K + O₂ -----> 2 KO
3.) K + S -----> KS
4.) 2 Ba + Br₂ -----> 2 BaBr
5.) 2 Ca + N₂ ------> 2 CaN
Explanation:
An equation is balanced when there is an equal amount of each element on both sides of a reaction. If there is an unequal amount, they can be altered by adding coefficients which modify the amount of an element/molecule. It is important that the coefficients are as small as possible while staying as whole numbers.
1.) ------------------------------------------------------------------------------------------------------
The unbalanced equation:
Mg + H₂ -----> MgH
Reactants: 1 magnesium, 2 hydrogen
Products: 1 magnesium, 1 hydrogen
The balanced equation:
2 Mg + H₂ ------> 2 MgH
Reactants: 2 magnesium, 2 hydrogen
Products: 2 magnesium, 2 hydrogen
2.) ------------------------------------------------------------------------------------------------------
The unbalanced equation:
K + O₂ -----> KO
Reactants: 1 potassium, 2 oxygen
Products: 1 potassium, 1 oxygen
The balanced equation:
2 K + O₂ -----> 2 KO
Reactants: 2 potassium, 2 oxygen
Products: 2 potassium, 2 oxygen
3.) ------------------------------------------------------------------------------------------------------
The unbalanced equation:
K + S -----> KS
Reactants: 1 potassium, 1 sulfur
Products: 1 potassium, 1 sulfur
This equation is already balanced with all the elements/compounds having coefficients of 1.
4.) ------------------------------------------------------------------------------------------------------
The unbalanced equation:
Ba + Br₂ -----> BaBr
Reactants: 1 barium, 2 bromine
Products: 1 barium, 1 bromine
The balanced equation:
2 Ba + Br₂ -----> 2 BaBr
Reactants: 2 barium, 2 bromine
Products: 2 barium, 2 bromine
5.) ------------------------------------------------------------------------------------------------------
The unbalanced equation:
Ca + N₂ ------> CaN
Reactants: 1 calcium, 2 nitrogen
Products: 1 calcium, 1 nitrogen
The balanced equation:
2 Ca + N₂ ------> 2 CaN
Reactants: 2 calcium, 2 nitrogen
Products: 2 calcium, 2 nitrogen
Consider a 175.7 g sample of the compound manganese(IV) perchlorate.
Using the formula Mn(ClO₄)₄ (MM = 452.74), What quantity in moles of oxygen are in 175.7 g of manganese perchlorate?
Answer:
6.21 moles O
Explanation:
To find the moles of oxygen, you need to (1) convert grams Mn(ClO₄)₄ to moles Mn(ClO₄)₄ (via molar mass) and then (2) convert moles Mn(ClO₄)₄ to moles O (via mole-to-mole ratio from formula subscripts). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.
Molar Mass (Mn(ClO₄)₄): 452.74 g/mol
1 Mn(ClO₄)₄ = 1 Mn and 4 Cl and 16 O
175.7 g Mn(ClO₄)₄ 1 mole 16 moles O
--------------------------- x ------------------- x --------------------------- = 6.21 moles O
452.74 g 1 mole Mn(ClO₄)₄
A compound has a percent composition of 81.71% C and 18.29% H. What is the empirical formula of this compound?
Considering the definition of empirical formula, the empirical formula is C₃H₈.
Definition of empirical formulaThe empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.
Empirical formula in this caseIn this case, in first place you know the percent composition:
C: 81.71 %H: 18.29%Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 81.71 grams of carbon and 18.29 grams of hydrogen H.
Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:
C: [tex]\frac{81.71 grams}{12\frac{grams}{mole} }[/tex]= 6.81 molesH:[tex]\frac{18.29 grams}{1\frac{grams}{mole} }[/tex]= 18.29 molesThe empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:
C: [tex]\frac{6.81 moles}{6.81 moles}[/tex]= 1H:[tex]\frac{18.29 moles}{6.81 moles}[/tex]= 2.68 ≅ [tex]\frac{8}{3}[/tex]To express this relationship in the form of simple integers, it is necessary to multiply by a simple number to achieve this:
C: 1×3 =3 H:≅ [tex]\frac{8}{3}[/tex]×3= 8Therefore the C: H mole ratio is 3: 8
Finally, the empirical formula is C₃H₈.
Learn more about empirical formula:
brainly.com/question/21081934
brainly.com/question/5115389
brainly.com/question/4594902
brainly.com/question/13725914
brainly.com/question/13599051
brainly.com/question/13112542
#SPJ1
A substance crystallizes with one atom at each corner, one atom on 8 of the edges, and one atom on 6 of the faces. How many atoms are present in one unit cell
The number of atoms in one unit cell with one atom at each corner, one atom on 8 of the edges, and one atom on 6 of the faces are 4.6atoms.
There is one atom at each corner and there are 8 corners in a unit cell, so there is one atom in each of the eight corners.
Therefore, the number of atom from corners = 1 x 1/8 = 1atom
There are 12 edges, since there are one atom on 8 of the edges the number of atom = 1 x 8/12 = 0.6atom
There is one atom at each face and there are 6 faces in a unit cell, each atom shares two face.
Therefore, the number of atoms on face = 2 x 1/6 = 3
Total number of atoms in one unit cell = 1 + 0.6 + 3 = 4.6atoms
Learn more about unit cell
https://brainly.com/question/13433017
#SPJ4
How much more uranium is there diffused in our oceans compared to what we can mine on land?
There is nearly 1000 times more uranium diffused in our oceans as compared to mine on land.
The world ocean contain more than 4 billion metric tons of dissolved uranium . Uranium is removed from ocean by diffusion across the sediment-water interface of organic-rich sediments.
Mining of Uranium on land.Uranium ore is deposits are economically recovered within earth crust. The uranium elements is common elements present in earth crust as it found 40 times more as compare to silver and 500 times more as compare to gold. It can found in everywhere in the rock , soil, river, and ocean.
learn about Uranium
https://brainly.com/question/9099776
#SPJ4
What part of the autonomic
nervous system calms you down
after an exciting event?
A. Somatic
B. Temporal lobe
C. Parasympathetic
Answer:
C. Parasympathetic
Explanation: