Answers

1. Calculate the molality of a sulfuric acid solution containing 24.4 g of sulfuric acid in 198 g of

water. The molar mass of sulfuric acid is 98.09 g.

Answer=1.26 m

2. What is the molality of a solution containing 7.78 g of urea [(NH₂)₂CO] in 203 g of water?

Answer=.640 m

3. Calculate the molality of each of the following solutions:

(a) 14.3 g of sucrose (C₁₂H₂₂O₁₁) in 676 g of water

Answer=.0618 m

(b) 7.20 moles of ethylene glycol (C₂H₆O₂) in 3546 g of water

Answer=2.03 m

4. Calculate the molality of each of the following aqueous solutions:

(a) 2.50 M NaCl solutions (density of the solution=1.08 g/mL)

Answer=2.68 m

(b) 48.2 percent by mass KBr solution.

Answer= 7.82 m