Hãy tìm công thức hóa học của những oxit có thành phần khối lượng như sau S:50%; C:42,8%; Mn:49,6%; Pb:86,6%

Answers

Answer 1

Answer:

Find the chemical formulas of oxides that contain the following composition:

S:50%; C:42,8%; Mn:49,6%; Pb:86,6%

Explanation:

In the given oxide of sulphur,

50%S is present that means remaining 50% is O.

Divide the % with atomic mass:

S                                     O

50/32= 1.5625            50/16=3.125

divide with smallest ratio:

1.5625/1.5625=1              3.125/1.5625=2

Hence, the formula of oxide is [tex]SO_2[/tex].

Similarly:

Carbon is 42.8% means the reamining % will be O that is 57.2%.

C                                                    O

42.8/12=3.575                         57.2/16=3.575

Divide with smallest ratio:

3.575/3.575=1                            3.575/3.575=1

Hence, the formula of oxide is CO.

Mn is 49.6% means the remining is % is O that is 50.4%.

First divide with atmic mass of respective element, then get the smallest ratio.

That gives the mole ratio of each constituent atom.

Mn                                 O

49.6/55.0=0.90            50.4/16=3.15

0.90/0.90=1                   3.15/0.90=3.5

Multiply with two

2                                        7

Hence, the formula becomes:

[tex]Mn_2O_7[/tex]

Pb is 86.6% means ---remaining 13.4% is O.

Pb                                               O

86.6/207 = 0.418 mol                13.4/16=0.85

0.418/0.418=1                               0.85/0.418=2.0

Hence, the formula is:[tex]PbO_2[/tex]  

   


Related Questions

When a substance melts, evaporates or boils, which four of the following things are true for it's particles?
Select four answers.


A. Lose energy

B. Gain energy

C. Move more

D. Move less

E. Become further apart

F. Become closer together

G. Overcome the attractive forces

H. The forces between them hold them more in place

Answers

Answer:

B, C, E, G

Explanation:

B - As particles are heated, they gain heat energy (or thermal energy, Q) from whatever the source may be.

C - Thermal energy particles gain is converted into kinetic, and the more KE/kinetic energy particles have, the more energy they have to move around.

E - When particles have more energy to move around more, they slide and move past each other and create more space; hence, they become further apart.

G - Eventually, particles will have enough energy and will move around so much that the attracting forces holding them together in the first place will be lesser than the particle's energy to break free and move from the attractive forces.

Please mark me as brianliest :D

A gas mixture contains 1.52 atm of Ne, 766 mmHg of He and Ar. What is the partial pressure, in atmospheres, of At if the gas mixture has a total pressure of 3.27atm

Answers

Answer:

0.74 atm.

Explanation:

From the question given above, the following data were obtained:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 766 mmHg

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Next, we shall convert the pressure of He from mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

766 mmHg = 766 mmHg × 1 atm / 760 mmHg

766 mmHg = 1.01 atm

Finally, we shall determine the partial pressure of Ar. This can be obtained as follow:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 1.01 atm

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Pₜ = Pₙₑ + Pₕₑ + Pₐᵣ

3.27 = 1.52 + 1.01 + Pₐᵣ

3.27 = 2.53 + Pₐᵣ

Collect like terms

3.27 – 2.53 = Pₐᵣ

Pₐᵣ = 0.74 atm

Thus the partial pressure of Ar is 0.74 atm.

State the optimum pH for sucrase activity and describe how sucrase activity changes at more acidic and more alkaline pH values.

Answers

Answer:

Explanation:

The rather high specific activity of intracellular sucrase towards sucrose is known to be optimal at pH 6.0 and at a temperature of about 30°C. And thus, we can say that the optimum pH for sucrase activity is exactly at 6. Also, it's behaviour is said to be decreasing with increasing acidic and increasing alkallinic values.

(20 points and excuse any offensive or seemingly bad language in this question) Budding and regeneration are two types of asexual reproduction.

Answers

Answer: true

Asexual reproduction is the process by which an organism is produced from a single parent cell. There are four major forms of asexual reproduction - budding, binary fission, regeneration and parthenogenesis. ... Regeneration is a type of asexual reproduction in which the organism is capable of regrowing certain body parts.

Explanation:

id k what u r talking abt but hope this helps

Which of the following are 'natural polymers
(bio-molecules)? Choose all that apply.
nylon
teflon
silk
cellulose
proteins
polyethylene

Answers

Answer:

cellulose

proteins

silk

Explanation:

A polymer is a macromolecule obtained by the combination of small molecules called monomers.

Polymers may be natural or synthetic. Natural polymers occur in nature. They may be part of living thing, and they include protein, cellulose and silk. These natural polymers are biological molecules.

Synthetic polymers are produced by industrial processes. Synthetic polymers include; nylon, Teflon and polyethylene.

¿QUE DATO DE LA CONFIGURACIÓN ELECTRÓNICA TE PERMITE UBICAR LOS ELEMENTOS QUÍMICOS EN LA TABLA PERIÓDICA?

Answers

The question is: WHAT DATA OF THE ELECTRONIC CONFIGURATION ALLOWS YOU TO LOCATE THE CHEMICAL ELEMENTS IN THE PERIODIC TABLE?

Explanation:

Elements which have same number of valence electrons tend to show similar chemical properties due to which they are placed in the same group.

Hence, electronic configuration of an element tells us the number of valence electrons present in an element. As a result, it becomes easy to locate the element in its respective group.

Which law states that the pressure and absolute temperature of a fixed quantity of gas are directly proportional under constant volume conditions?
Boyle’s law
Charles’s law
Dalton’s law
Gay-Lussac’s law

Answers

Answer:

Gay-Lussac’s law

Explanation:

Gay-Lussac’s law is one of the gas laws discovered and proposed by a French scientist called Joseph Gay Lussac (1778 - 1850). In this law, it is stated that the pressure (P) of a gas varies directly with the absolute temperature (T) at a constant volume.

That is;

: P ∝ T

: P/T = K

Where:

P = pressure exerted by the gas

T = absolute temperature of the gas

K = the constant.

Hence, according to this question, the law that states that "the pressure and absolute temperature of a fixed quantity of gas are directly proportional under constant volume conditions" is Gay-Lussac’s law.

Answer:

D. Gay-Lussac’s law

Explanation:

have a great day :)

What is the frequency of an electromagnetic wave that has a wavelength of 8.5 x 10^2 m in a vacuum? (The speed of light in a vacuum is 3.00 x 10^8 m/s.)

A. 1.2 x 10^-3 Hz
B. 2.8 x 10^-6 Hz
C. 3.5 x 10^5 Hz
D. 2.6 x 10^11 Hz

Answers

Answer:

C=3.5 x 10^5 Hz

1234567890123345678901234567890

Answers

Answer:

1234567890123345678901234567890

Explanation:

trick question....

How many individual decay steps are in the decay chain of
uranium-238 before the stable end product of lead-206 is
produced?

Answers

Answer:

432

Explanation:

Is the number of electrons in different shells of an atom fixed or unlimited ? Explain by giving an example.​

Answers

Answer:

the number of electrons in a particular shell is given by the formula 2n^2 . However an electron when gets very exicited loose energy in the forms of radiation and comes in high energy level shell.

Why does platinum metal make a good catalytic surface for reactant molecules?
It causes reactant molecules to be less reactive.
It strengthens bonds between reactant molecules.
It prevents products from breaking away from the surface.
It holds reactant molecules in a good position for them to react.

Answers

Answer:

it holds reactant molecules in a good position for then to react

Answer:

D. It holds reactant molecules in a good position for them to react.

Explanation:

Got a 100 on e2020.

A flexible container has 5.00 L of nitrogen gas at 298 K. If the temperature is
increased to 333 K, what will be the new volume of that sample of nitrogen?

1) 0.179 L
2) 0.223 L
3) 4.47 L
4) 5.59

Answers

Answer: 5.59 L

Explanation: I'm pretty sure it's this. I just took this test and got it right. Hope this helps you out! :))

Answer:

5.59 L

Points earned on this question: 4

Explanation:

took the test

1.1 Define the concept risky behaviour?​

Answers

Answer:

Risky behavior or risk-taking behavior is defined according to Trimpop (1994) as “any consciously, or non-consciously controlled behavior with a perceived uncertainty about its outcome, and/or about its possible benefits, or costs for the physical, economic or psycho-social well-being of oneself or others.” In addition to this broad definition, there are other definitions of risky behavior depending on the field of research. While in the economic view, risk is defined in terms of the variability of possible monetary outcomes, in the clinical literature, the risk is generally defined as exposure to possible loss or harm (Schonberg, Fox, & Poldrack, 2011). Turner et al. (2004) described risk-taking behavior further as either a socially unacceptable volitional behavior with a potentially negative outcome in which precautions are not taken, such as speeding, drinking and driving, drugs abuse, unprotected sex and so on.

Cheese is an example of Solid in gas colloid Liquid in gas colloid Solid in liquid colloid Liquid in solid colloid

Answers

The solution in which the solute particles are suspended in a liquid (fluid) is called colloidal solution. Colloid is a solution that has particles ranging between 1 and 1000 nanometres. Cheese is a solid emulsion in which liquid is solute and solid is solvent. Hence, cheese is colloidal solution of liquid in solid.

when water is added pH of the acidic solution
1 remain same
2 increases
3 decrease s
4 become zero

Answers

Answer:

the solution becomes less concentrated... meaning there is a decrease in acidity ...hence the pH slightly increases as lesser ph

means more acidity

Alpha particles cannot penetrate the skin. In which of the following circumstances could they still threaten human health?

A. If they travel into the human eye.
B. If they are inhaled or swallowed.
C. If they enter into the human ear.
D. If they are touched.

Answers

Answer:

B. If they are inhaled or swallowed.

As the ZnCl2 dissolved, it separated into zinc ions and chloride ions. Choose the correct reaction.


A. Zinc was oxidized, chlorine was reduced.


B. Zinc was reduced, chlorine was oxidized.


C. This was not a redox reaction.

Answers

Answer:

This was not a redox reaction

Explanation:

A redox reaction is one in which a specie is oxidized and another specie is reduced. This means that one specie gains electrons while the other specie looses electrons.

Zinc chloride solid is composed of zinc ions and chloride ions. The ions only become free in solution. There is no change in the oxidation numbers of the ions as they dissolve in water.

Since the oxidation numbers of the species do not change, the process is not a redox reaction

6. If more reactants are used in a chemical reaction, more products will be produced. This is
because a) More reactants cause the reaction to heat up
b) More reactants take up the same volume
c) More reactants have more atoms to react to form more products
d) Too many products can slow down the reaction

Answers

Answer:

D

Explanation:

which chemical formula describes carbon monoxide?
a) CO
b) CO2
c) C100
d) CH4

Answers

Es(CO) .

muchas gracias!!

Answer:

[tex]{ \bf{a). \: CO}}[/tex]

what are primary miniral nutrient in plant grawth​

Answers

Mark Brainliest please

Answer


There are 17 nutrients that essential for the growth of the plants. These nutrients are classified into two categories on the basis of requirement micronutrients (required in less amount) and macronutrient (required in large amount). The three primary nutrients needed for plant growth are nitrogen, phosphorous and potassium.

What volume of 12 M NaOH and 2 M NaOH should be mixed to get 2 litres of 9 M NaOH solution?​

Answers

So you add 1.4 L of 12M NaOH to 0.6 L of 2M NaOH to get 2 L of 9M NaOH.

The volume of 12 M NaOH and 2 M NaOH should be mixed to get 2 litres of 9 M NaOH solution is 1.4 L and 0.6 L

What is Concentration ?

In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture.

Several types of mathematical description can be distinguished: mass concentration, molar concentration, number concentration, and volume concentration.

Amount of stuff = concentration x volume.

We can set up 2 equations:

V₁ = volume 12M NaOH.V₂ =  volume 2M NaOH.

(12×V₁) + (2×V₂) = 9×2 = 18

12V₁ + 2V₂ = 18 (1)

V₁ + V₂ = 2 (2)

From (2) we get:

V₁ = (2 − V₂)

Substituting  V₁ back into (1)  ⇒

12 (2−V₂) + 2V₂ = 18

24 − 12V₂ + 2V₂ = 18

10V₂ = 6

V₂ = 0.6L

From (2) we can say:

V₁ + 0.6 = 2

V₁ = 2 − 0.6 = 1.4L

Therefore, The volume of 12 M NaOH and 2 M NaOH should be mixed to get 2 litres of 9 M NaOH solution is 1.4 L and 0.6 L

Learn more about concentration here ;

https://brainly.com/question/19221273

#SPJ2

What causes hurricane on Saturn?

Answers

Hurricanes on Saturn are caused by when the water clouds heat up and rise, causing storms (not too sure if this is the right answer, hope it helped).

DIRECTION:Tell how charging takes place in each illustration.​

Answers

Answer:

Due to static charges.

Explanation:

In the illustration, we can see that when we bring the magnet close to the body, the static charges present on the body rearrange theirselves and attracted by the magnet. The magnetic substance is responsible for the arrangement of charges on the body and when they are arranged, they attract each other so we can say that static charges are present on the body and rearrangement occurs in the body.

Which statement best describes John Dalton’s use of creativity in his work?

Answers

Answer:

c

Explanation:

What is a covalent bond ?

Answers

What is a covalent bond ?

Answer is c A bond between two atoms resulting from a transfer of an electron.

Explanation:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

A covalent bonds is a bond between two atoms that is made up of share electrons.

Options B is correct.

TIMED PLS HELP AND WILL GIVE BRAINLIST
Given the following reaction:

2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O

If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?

Answers

Answer:

19.4 g of alum, will be its theoretical yield

Explanation:

The reaction is:

2 Al + 2 KOH + 4 H₂SO₄ + 22H₂O → 3H₂ + 2KAl(SO₄)₂•12H₂O

Let's determine the amount of acid.

M are the moles contained in 1 L of solution or it can be mmoles that are contained in 1 mL of solution

M = mmol /mL

M . mL = mmol

We replace: 8.3 mL . 9.9 M = 82.17 mmoles

We convert to moles: 82.17 mmol . 1 mol / 1000mmol = 0.082 moles

Ratio is 4:2

4 moles of sulfuric acid can make 2 moles of alum

By the way, 0.082 moles of acid may produce ( 0.082 . 2) /4 = 0.041085 moles.

We convert moles to mass:

Molar mass of alum is: 473.52 g/mol.

0.041085 moles . 473.52 g/mol = 19.4 g

How many particles are in 54.5 g of aluminum? Show your work.
A. Convert the mass of aluminum to moles of aluminum. Molar mass of aluminum (Al) = 26.98 g/mol
B. Convert the moles of aluminum to particles of aluminum. There are 6.02 x 1023 particles/mol.

Answers

There are 1.216x10^24 particles in 54.5g of aluminum.

A. 54.5/26.98 = 2.02mols of aluminum

B. 2.02mols*6.02x10^23 particles/mol = 1.216x10^24

What is the molarity of a solution prepared by adding enough water to 2 g of acetone to make a total volume of 1.60 l?

Answers

Explanation:

answer is in photo above


4 Calculate the mass of tin that can be extracted from 100 kg of tin ore that contains
1% tin by mass. Calculate the mass of waste produced.

Answers

Answer:

formula for calculating mass is

first U will HV to find number of moles

m=n×M

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