An aqueous solution of 15.7 M ammonia, NH3, has a density of 0.892 g/mL. The per

Question

An aqueous solution of 15.7 M ammonia, NH3, has a density of 0.892 g/mL. The percent by mass of NH3 in the solution is?

An aqueous solution is 22.0% by mass silver nitrate, AgNO3, and has a density of 1.22 g/mL. The molarity of silver nitrate in the solution is?

Match the following aqueous solutions with the appropriate letter from the column on the right.

1. 0.13 m NiI2    A. Highest boiling point 2. 0.24 m FeSO4 B. Second highest boiling point 3. 0.11 m AlCl3 C. Third highest boiling point 4. 0.45 m Sucrose(nonelectrolyte) D. Lowest boiling point

Explanation / Answer

1) 15.7 M means , 15.7 mol NH3 present in 1 liter solution.

mass of solution = 1000*0.892 = 892 grams

mass of solute = 15.7*17 = 266.9 grams

percent by mass = 266.9/892*100 = 29.92%

2) 22 grams of AgNO3 present in 100 grams solution.

volume of solution = 100/1.22 = 81.96 ml

molarity = (22/169.87)*(1000/81.96) = 1.58 M

3)

1. B

2. C

3. A

4. D

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