CH4(g)+2O2(g)→CO2(g)+2H2O(g)            ΔH°<0

Which of the following statements must be true for the combustion of CH4(g), represented by the equation above?

A) The bond dissociation energy between O atoms in O2 is greater than the sum of the bond dissociation energies of the two O−H bonds in H2O.

B) More bonds are formed in the products than are broken in the reactants.

C) The sum of the bond dissociation energies of the product molecules is equal to the sum of the bond dissociation energies of the reactant molecules.

D) The sum of the bond dissociation energies of the product molecules is greater than the sum of the bond dissociation energies of the reactant molecules.

The percentage yield of the oxygen gas is 60%.

The reaction equation is;

2H^+ + H2O2 + 2MnO4 -> 2MnO2 + 4H2O + 3O2

Number of moles of hydrogen peroxide = 30/1000 * 0.30 M = 9 * 10^-3 moles

Number of moles of  potassium permanganate = 30/1000 * 0.30 M = 9 * 10^-3 moles

Now;

1 mole of H2O2 reacts with 2 moles of permanganate

 9 * 10^-3 moles of H2O2 reacts with  9 * 10^-3 moles * 2 moles/1 mole  

= 1.8 * 10^-2 moles

Hence, permanganate is the limiting reactant

b) The theoretical yield of oxygen is;

2 moles of oxygen produced 3 moles of O2

9 * 10^-3 moles oxygen  produced 9 * 10^-3 moles *  3 moles/2 moles

= 0.0135 moles

If 1 mole of O2 occupies 22.4 L

0.0135 moles of O2 occupies 0.0135 moles * 22.4 L/ 1 mole

= 0.302 L or 302 mL

c) Percentage yield of oxygen = 178 mL/ 302 mL * 100/1

= 60%

Learn more about percentage yield:https://brainly.com/question/27492865

#SPJ1

Answer:

D.) Zn + H₂SO₄ ----> ZnSO₄ + H₂

Explanation:

Single-Replacement Reaction: a reaction in which an element in a compound is swapped with another element

    ex.) Zn + H₂SO₄ ----> ZnSO₄ + H₂

Double-Replacement Reaction: a reaction in which a cation in one compound is swapped with a cation in another

    ex.) Ba(OH)₂ + H₂SO₄ ----> BaSO₄ + 2 H₂O

Synthesis Reaction: a reaction in which two or more elements/compounds combine to form a new molecule

    ex.) 2 Mg + O₂ ----> 2 MgO

    ex.) H₂O + CO₂ ----> H₂CO₃

Answer:

6.0 x 10³ - 2.3 x 10³ = 3700

3700 ---------> 3.7 x 10³

7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.

Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]

Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's Constant / Avogadro's Number.

Avogadro's Number = 6.022 × 10²³

Now put the values in above formula we get

Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]

                             = [tex]\frac{4.41 \times 10^{24}}{6.022 \times 10^{23}}[/tex]

                             = 7.32 moles

Thus from the above conclusion we can say that 7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.

Learn more about the Avogadro's Number here: https://brainly.com/question/1581342

#SPJ1

Taking into account the definition of dilution, the concentration of the new solution is 1 mol/L.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

6 mol/L× 200 mL= Cf× 1200 mL

Solving:

(6 mol/L× 200 mL)÷ 1200 mL= Cf

1 mol/L= Cf

In summary, the concentration of the new solution is 1 mol/L.

Learn more about dilution:

brainly.com/question/6692004

brainly.com/question/16343005

brainly.com/question/24709069

#SPJ1

Answer:

I'm thinking you should go for the option C.

Answer:

Options

*A) 60 cm3 = Correct.* This is the answer

B) 10 cm3

C) 40 cm3

D) 30 cm3

E) 70 cm3

Explanation:

According to the research, a hazard is the real possibility that we will suffer some harm. An example of a hazard is free toxic gases.

It is associated with situations that have potentially harmful effects on the body, the environment or property.

In chemistry, it is understood as those conditions of potential health damage caused by uncontrolled exposure to chemical agents of various kinds, such as the release of toxic and flammable gases such as ethanol.

Therefore, we can conclude that according to the research, a hazard is the real possibility that we will suffer some harm. An example of a hazard is free toxic gases.

Learn more about a hazard here: https://brainly.com/question/13340017

#SPJ1

The correct answer to the problem is 0.193 which is three significant figures.

The term significant figures has to do with the figures that have a mathematical meaning. We know that the result has to correspond to the highest number of significant figures.

Hence, If we multiply 0.34 x 0.568 the result ought to be recorded as 0.193 which is three significant figures.

Learn more about significant figures:https://brainly.com/question/14804345

#SPJ1

Answer:

4.69 x 10²⁴ molecules CH₄

Explanation:

To find the amount of molecules, you need to (1) convert grams to moles (via molar mass) and then (2) convert moles to molecules (via Avogadro's Number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (125 g).

Molar Mass (CH₄): 16.05 g/mol

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

125 g CH₄         1 mole            6.022 x 10²³ molecules
----------------  x  ---------------  x  -------------------------------------  =  
                          16.05 g                       1 mole

=  4.69 x 10²⁴ molecules CH₄

Answer:

The uncertainty principle says this view is only a guess, a snapshot of what the electrons around the nucleus could possibly look like. Specifically, the uncertainty principle says that we cannot know the exact location and speed of the electrons. Therefore, the planetary-like arrangement of the electrons around the nucleus is rarely ever assumed.

Filling out the table of elements below following the outlined order:

An element can be defined as a substance that can not be broken down into simpler substances.

An element serves as a building blocks for compounds and mixtures.

In conclusion, each element and its property as requested in the table are given above.

Learn more about element : brainly.com/question/18096867

#SPJ1

Answer:

Nuclear fuel has a higher energy density than fossil fuel

The pH of the solution is obtained to be 9.67.

A buffer is a solution that serves to militate against changes in acidity or alkalinity. The buffer is often made of a solution of a strong acid and its salt or a weak base and its salt.

Now we have the that;

Number of moles of base = 250 /1000 *  0.80 = 0.2 moles

Number of moles of salt = 150/1000 *  0.50 = 0.075 moles

Total volume of the solution = 250 + 150 = 400 mL or 0.4 L

Molarity of the base = 0.2 moles/0.4 L = 0.5 M

Molarity of the salt =  0.075 moles/ 0.4 L = 0.1875 M

pKb = - log( 1.8 x 10^-5) = 4.74

pOH = pKb + log [salt/base]

pOH =  4.74 + log (0.1875/ 0.5)

pOH = 4.33

pH = 14 - 4.33

pH = 9.67

The pH of the solution is obtained to be 9.67.

Learn more about pH:https://brainly.com/question/15289741

#SPJ1

The volume of 2.0 mol/L cobalt(II) chloride solution required for the reaction is 187.5 mL

Mole = molarity × volume

Mole of Na₂CO₃ = 1.5 × 0.25

Mole of Na₂CO₃ = 0.375 mole

Balanced equation

CoCl₂ + Na₂CO₃ -> CoCO₃ + 2NaCl

From the balanced equation above,

1 mole of Na₂CO₃ reacted with 1 mole of CoCl₂.

Therefore,

0.375 mole of Na₂CO₃ will also react with 0.375 mole of CoCl₂.

Volume = mole / molarity

Volume of CoCl₂ = 0.375 / 2

Volume of CoCl₂ = 0.1875 L

Multiply by 1000 to express in mL

Volume of CoCl₂ = 0.1875 × 1000

Volume of CoCl₂ = 187.5 mL

Learn more about stoichiometry:

https://brainly.com/question/14735801

#SPJ1

The volume of 0.555M KNO3 solution would contain 12.5 g of solute iss 223 mL.

The mass of solute in a given volume of solution is related by the formula below:

Therefore, volume of solution is given by:

Volume = Mass /molarity * molar mass

Molar mass of KNO₃ = 101 g/mol

Volume = 12.5/(0.555 * 101)

Volume = 0.223 L or 223 mL

In conclusion, the volume of the solution is obtained from the molarity of solution as well as mass and molar mass of solute.

Learn more about molarity and volume at: https://brainly.com/question/26873446
#SPJ1

Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.

Earth's rotation, gravity, and mantle dynamics are the forces that play a significant role in influencing the size, shape, and positioning of the different landmasses of our continents and islands. These forces are responsible for the change in shape of land masses with the passage of time.

So we can conclude that Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.

Learn more about tectonic here: https://brainly.com/question/1162125

#SPJ1

Describes the movement of the plates across the Earth's lithosphere?

From the first law of thermodynamics, the work done is -36 J.

We are told that the gas is expanding hence it does work while heat is absorbed from the surroundings. This implies that q is positive while w is negative.

Hence;

U = q - w

w = q - U

w =  89J - 125J

w = -36 J

Learn more about first law of thermodynamics:https://brainly.com/question/3808473

#SPJ1

In the case the relative strength of the two forces C and D is that D represents a ion-dipole forces, which are known to be very much stronger than the force that is said to be represented by C.

A concept map is known to be a kind of a special type of a web diagram that is often used in the exploration of knowledge and gathering and also in sharing of information.

Note that Concept mapping is a strategy used in creating the idea of a map as it is made up of  a visual depiction of ideas, theories, and others.

Note that Intermolecular forces are known to be those forces that are said to be attractive and also a kind of a repulsive forces that is seen between the molecules of a substance.

Looking at the image attached, In regards to the relative strength of the two forces C and D. The fact is that D stands for ion-dipole forces, which are known to be very much stronger than the force that is said to be represented by C.

Learn more about ion-dipole forces from

https://brainly.com/question/7462594

#SPJ1

Answer:

979 atm

Explanation:

To calculate the osmotic pressure, you need to use the following equation:

π = i MRT

In this equation,

-----> π = osmotic pressure (atm)

-----> i = van't Hoff's factor (number of dissolved ions)

-----> M = Molarity (M)

-----> R = Ideal Gas constant (0.08206 L*atm/mol*K)

-----> T = temperature (K)

When LiCl dissolves, it dissociates into two ions (Li⁺ and Cl⁻). Therefore, van't Hoff's factor is 2. Before plugging the given values into the equation, you need to convert Celsius to Kelvin.

i = 2                             R = 0.08206 L*atm/mol*K

M = 20 M                    T = 25°C + 273.15 = 298.15 K

π = i MRT

π = (2)(20 M)(0.08206 L*atm/mol*K)(298.15 K)

π = 979 atm

Answer:

Explanation:

yogurt is a colloid because of the milk/dairy in it. yogurt is a complex colloid.

As yogurt includes living bacterial cultures, proteins, lipids, and milk solids in addition to water, yoghurt is a colloid.

Yoghurt is a colloid because it contains living bacterial cultures, proteins, lipids, and milk solids in addition to water. A colloid forms a homogenous mixture rather than settling or separating over time because the particles or components are uniformly distributed throughout the medium. A water-in-oil emulsion, specifically yoghurt is regarded as an emulsion colloid. This implies that water droplets are evenly distributed across an ongoing fat or oil matrix. The matrix of yoghurt is made up of milk solids, proteins, and lipids, and the water phase is present as droplets. Lactic acid is produced when bacteria in the bacterial culture, including Lactobacillus bulgaricus and Streptococcus thermophilus, ferment milk's lactose.

To know more about colloid, here:

https://brainly.com/question/14507793

#SPJ6

The molality of the lithium ions is calculated as 0.906 m

Given that the compound is written as Li₃PO₄, the dissociation of the compound is given by the  equation;

Li₃PO₄ -----> 3Li^+ + PO₄^3-

Since there are three mole of lithium ions in the compound, it the follows that the molality of the lithium ions is;

3 * 0.302 m = 0.906 m

Learn more about molality:https://brainly.com/question/17034043

#SPJ1

The reaction H₂SO₄ + Ca ⇒ CaSO₄ + H₂ is a Single Replacement reaction because Ca replaces H in H₂SO₄.

It is a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

Let's consider the following reaction.

H₂SO₄ + Ca ⇒ CaSO₄ + H₂

What kind of reaction is this?

The reaction H₂SO₄ + Ca ⇒ CaSO₄ + H₂ is a Single Replacement reaction because Ca replaces H in H₂SO₄.

Learn more about Single Replacement here: https://brainly.com/question/2057969

#SPJ1

Answer:

Mg₂P₂O₇ · 3 H₂O

Explanation:

(Step 1)

First, you need to convert each mass to moles via the molar masses of each element/compound.

Molar Mass (Mg): 24.305 g/mol

4.86 grams Mg              1 mole
------------------------  x  ------------------------  = 0.200 moles Mg
                                   24.305 grams

Molar Mass (P): 30.974 g/mol

6.20 grams P              1 mole
---------------------  x  ------------------------  =  0.200 moles P
                                30.974 grams

Molar Mass (O): 15.998 g/mol

11.20 grams O               1 mole
-----------------------  x  -----------------------  =  0.700 moles O
                                  15.998 grams

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

5.40 grams H₂O               1 mole
--------------------------  x  -----------------------  =  0.300 moles H₂O
                                     18.014 grams

(Step 2)

To find the amount of each element/compound in the formula, you need to divide each molar value by the smallest molar value. This allows you to determine the accurate molar ratio the hydrated salt should have. In this case, 0.200 moles is the smallest value.

0.200 moles Mg / 0.200  =  1 mole Mg

0.200 moles P / 0.200  =  1 mole P

0.700 moles O / 0.200  =  3.5 moles O

0.300 moles H₂O / 0.200  =  1.5 moles H₂O

There can only be whole number amounts of each element/compound in the formula. Therefore, you need to multiply each amount by 2.

1 mole Mg x 2 = 2 moles Mg

1 mole P x 2 = 2 moles P

3.5 moles O x 2 = 7 moles O

1.5 moles H₂O x 2 = 3 moles H₂O

(Step 3)

Now that we know the amount of each element/compound, we can build the formula. The amount of each element is represented by subscripts and the amount of each compound (H₂O) is represented by coefficients.

Mg₂P₂O₇ · 3 H₂O

The volume of the CO₂ produced at STP, given the data is 141 mL

P₁V₁ / T₁ = P₂V₂ / T₂

Where

P₁V₁ / T₁ = P₂V₂ / T₂

(99.81 × 156) / 298 = (101.325 × V₂) / 273

Cross multiply

298 × 101.325 × V₂ = 99.81 × 156 × 273

Divide both sides by 298 × 101.325

V₂ = (99.81 × 156 × 273) / (298 × 101.325)

V₂ = 141 mL

Thus, the volume of the CO₂ produced at STP is 141 mL

Learn more about gas laws:

https://brainly.com/question/6844441

#SPJ1

Answer:

424 °C

Explanation:

If all other variables are held constant, the missing temperature can be found using the Charles' Law equation:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can plug the given values into the equation and simplify to find the final temperature.

V₁ = 435 mL                    V₂ = 842 mL

T₁ = 219 °C                       T₂ = ? °C

V₁ / T₁ = V₂ / T₂                                          <----- Charles' Law

435 mL / 219 °C = 842 mL / T₂                <----- Insert values

1.9863 = 842 mL / T₂                               <----- Simplify left side

(1.9863) x T₂ = 842 mL                             <----- Multiply both sides by T₂

T₂ = 424 °C                                              <----- Divide both sides by 1.9863

Answer:

CH3CH2OH

Explanation:

CH3CH2OH the ethanol is regarded as neutral since pH is very close to 7 and CH3CHO or acetaldehyde is an extremely weak basic max pH of 8.

Answer: 962 torr

Explanation:

The equation for carbon-14 emission by Radium-223 nuclei is given below:

[tex]^{223}_{88}Ra \rightarrow\: ^{209}_{82}Pb + \:^{14}_{6}C[/tex]

Radioactivity is the spontaneous decay of a substance with emission of radiation.

The equation for carbon-14 emission by Radium-223 nuclei is given below:

[tex]^{223}_{88}Ra \rightarrow\: ^{209}_{82}Pb + \:^{14}_{6}C[/tex]

In conclusion, the emission of carbon-14 by Radium-223 nuclei produces Lead-209 nuclei.

Learn more about radioactivity at: https://brainly.com/question/3603596

#SPJ1

The thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production is an industrial production of nano-sized titanium dioxide (TiO2).

Thermodynamics is defined as the change in the energy of system that brings about work in that system.

The leaching of ilmenite which is a titanium-iron oxide mineral with HCl can lead to the production of titanium dioxide (TiO2).

The use of thermodynamics in this process controls the heat and energy of the leaching system leading to a better yield of final products.

Learn more about thermodynamics here:

https://brainly.com/question/13059309

#SPJ1