1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Karo-lina-s [1.5K]
3 years ago
5

A 0.8870 g sample of a mixture of NaCl and KCl is dissolved in water, and the solution is then treated with an excess of AgNO3 t

o yield 2.142 g of AgCl. Calculate the percent by mass of each compound in the mixture
Chemistry
1 answer:
bagirrra123 [75]3 years ago
3 0

Answer : The percent by mass of NaCl and KCl are, 92.22 % and 7.78 % respectively.

Explanation :

As we know that when a mixture of NaCl and KCl react with excess AgNO_3 then the silver ion react with the chloride ion in both NaCl and KCl to form silver chloride.

Let the mass of NaCl be, 'x' grams and the mass of KCl will be, (0.8870 - x) grams.

The molar mass of NaCl and KCl are, 58.5 and 74.5 g/mole respectively.

First we have to calculate the moles of NaCl and KCl.

\text{Moles of }NaCl=\frac{\text{Mass of }NaCl}{\text{Molar mass of }NaCl}=\frac{xg}{58.5g/mole}=\frac{x}{58.5}moles

\text{Moles of }KCl=\frac{\text{Mass of }KCl}{\text{Molar mass of }KCl}=\frac{(0.8870-x)g}{74.5g/mole}=\frac{(0.8870-x)}{74.5}moles

As, each mole of NaCl and KCl gives one mole of chloride ions.

So, moles of chloride ions in NaCl = \frac{x}{58.5}moles

Moles of chloride ions in KCl = \frac{(0.8870-x)}{74.5}moles

The total moles of chloride ions = \frac{x}{58.5}moles+\frac{(0.8870-x)}{74.5}moles

Now we have to calculate the moles of AgCl.

As we know that, this amount of chloride ion is same as the amount chloride ion present in the AgCl precipitate. That means,

Moles of AgCl = Moles of chloride ion = \frac{x}{58.5}moles+\frac{(0.8870-x)}{74.5}moles

Now we have to calculate the moles of AgCl.

The molar mass of AgCl = 143.32 g/mole

\text{Moles of }AgCl=\frac{\text{Mass of }AgCl}{\text{Molar mass of }AgCl}=\frac{2.142g}{143.32g/mole}=0.0149moles

Now we have to determine the value of 'x'.

Moles of AgCl = \frac{x}{58.5}moles+\frac{(0.8870-x)}{74.5}moles

0.0149 mole = \frac{x}{58.5}moles+\frac{(0.8870-x)}{74.5}moles

By solving the term, we get the value of 'x'.

x=0.818g

The mass of NaCl = x = 0.818 g

The mass of KCl = (0.8870 - x) = 0.8870 - 0.818 = 0.069 g

Now we have to calculate the mass percent of NaCl and KCl.

\text{Mass percent of }NaCl=\frac{\text{Mass of }NaCl}{\text{Total mass of mixture}}\times 100=\frac{0.818g}{0.8870g}\times 100=92.22\%

\text{Mass percent of }KCl=\frac{\text{Mass of }KCl}{\text{Total mass of mixture}}\times 100=\frac{0.069g}{0.8870g}\times 100=7.78\%

Therefore, the percent by mass of NaCl and KCl are, 92.22 % and 7.78 % respectively.

You might be interested in
A gas occupies 3.5L at 2.5 atm of pressure. What is the volume at 787 torr at the same temperature?
Kitty [74]

Answer: 8.45 L

Explanation:

Given that,

Initial volume (V1) = 3.5L

Initial pressure (P1) = 2.5 atm

[Since final pressure is given in torr, convert 2.5 atm to torr

If 1 atm = 760 torr

2.5 atm = 2.5 x 760 = 1900 torr

Final volume (V2) = ?

Final pressure (P2) = 787 torr

Since pressure and volume are given while temperature remains the same, apply the formula for Boyle's law

P1V1 = P2V2

3.5L x 1900 torr = 787 torr x V2

6650L•torr = 787 torr•V2

Divide both sides by 787 torr

6650L•torr/787 torr = 787 torr•V2/787 torr

8.45 L = V2

Thus, the volume of the gas at 787 torr and at the same temperature is 8.45 Liters

5 0
3 years ago
What is the name for the compound formed between nitrogen and magnesium. (show your work)
astra-53 [7]

Answer:

the compound formed between nitrogen and magnesium is Magnesium Nitride

7 0
3 years ago
How does upwelling affect coastal fisheries?<br> look atthe pic
djverab [1.8K]
I believe the answer is D because warm water generally has more nutrients than cold water. 

It does not improve the nutrients so it isn't B or C.

Hope this helps!
7 0
3 years ago
Read 2 more answers
Are parts of the circulatory system<br> .The<br> , and
Sphinxa [80]

Answer:

The heart and the blood vessels are a part of the circulatory system. The blood vessels include the arteries, veins and capillaries. The lungs are considered to be the pulmonary part of the circulatory system. The heart is the cardiovascular part of the circulatory system and the vessels are the systemic part of the circulatory system. The main function of the circulatory system is to supply all parts of the body with oxygenated blood and to take away the deoxygenated blood from all parts of the body.

8 0
3 years ago
777,600 seconds to days
Alik [6]

Answer:

9 days

No explanation needed.

8 0
2 years ago
Other questions:
  • What is the pressure of 0.540 mol of an ideal gas at 35.5 L and 223 K?
    6·1 answer
  • What would happen if Phosphorus disappeared?
    10·1 answer
  • An engine needs a replacement part that will be exposed to high heat. A(n) _____ would be the best type of material to use to ma
    9·1 answer
  • What are the four states of matter?
    5·2 answers
  • Which of these choices best describes a pedigree?
    6·1 answer
  • Please explain the difference between reactants and products in a chemical reaction.
    11·1 answer
  • 26. Which type of element has properties that are intermediate between metals and nonmetals?
    12·1 answer
  • 1. X-linked (also called sex-linked traits) are inherited on the _____ chromosome.
    15·1 answer
  • The reaction N2O4↽−−⇀2NO2 is allowed to reach equilibrium in a chloroform solution at 25 ∘C . The equilibrium concentr
    10·1 answer
  • Find the pH of the equivalence point(s) and the volume (mL) of 0.0372 M NaOH needed to reach the point(s) in titrations of(a) 42
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!