CHEM 24112 Chapter Notes - Chapter 15: Sodium Chloride, Ammonium Chloride, Ammonium Nitrate

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29 Jun 2018

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Homework 15.2: Mass Percent

1. A solution that is 9% by mass glucose contains 9 g of glucose in every _____________ g of solution.

2. Calculate the percent by mass of solute in each of the following solutions.

a. 5.15 g of ammonium chloride dissolved in 15.0 g of water

b. 5.15 g of ammonium chloride dissolved in 39.2 g of water

c. 5.15 g of ammonium chloride dissolved in 125 g of water

d. 5.15 g of ammonium chloride dissolved in 125 mg of water

3. Calculate the mass, in grams, of solute present in each of the following solutions.

a. 225 g of 2.91% ammonium nitrate solution

b. 225 mg of 2.91% ammonium nitrate solution

c. 100. g of 4.95% potassium bromide solution

d. 1.00 kg of 4.95% potassium bromide solution

4. A laboratory assistant prepared a potassium chloride solution for her class by dissolving 5.34 g of

KCl in 152 g of water. What is the mass percent of the solution she prepared?

5. A sample of brass contains 71.2 g copper, 28.7 g zinc, and 1.03 g tin. Calculate the percentage of

each component present in the brass sample.

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7. Complete the following table:

Element Moles Mass Num

7. Complete the following table:

Element Moles Mass Number of molecules

13. It is the component that is in a solution, in smaller quantity.

a. Solution

b. Solvent

c. Solvent

d. Soluto

14. It is the component that is in a solution in greater quantity.

a. Solution

b. Solvent

c. Solvent

d. The answers b and c are correct.

15. The quantitative expression of the dissolved amount of solute in a quantity determined solvent is known as:

a. Solution

b. Volume

c. Concentration

d. Stoichiometry

16.Express the moles of solute among the liters of solution

a. Molality

b. Molarity

c. % weight by volume

d. % weight by weight

17.Express the moles of solute between kg of solvent

a. Molarity

b. ppm

c. ppt

d. Molality

18. What is the molarity of a solution prepared by dissolving 7.50 g of nitrate of magnesium, Mg (NO3) 2 in enough water to prepare 25.0 mL of solution?

a. 10.3 M

b. 5.6 M

c. 6.5 M

d. 2.03 M

19. How many grams of sodium chloride, NaCl are needed to prepare 125 mL of 0.037 M NaCl solution

a. 1.021 M

b. 0.268 M

c. 0.201 M

d. 0.500 M

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21. A solution of ethylene glycol contains 21.2 g of ethylene glycol (C2H6O2) in 85.4 mL of water. Calculate the freezing point and the boiling point of the solution. (Assume the water density is 1.00 g / mL)

22. At what volume should you dilute 75 mL of a 10.0 M solution of H2SO4 to obtain a 1.75 M solution of H2SO4.

CHEM 24112 Chapter Notes - Chapter 15: Sodium Chloride, Ammonium Chloride, Ammonium Nitrate

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