Question

The density of a $10.0\%$ by mass of KCl solution in water 1.06 g/mL. Calculate molarity, molality and mole fraction of KCl in this solution respectively.

• A. 3.42 M; 1.489 m; 0.046
• B. 2.42 M; 1.489 m; 0.026
• C. 1.42 M; 1.489 m; 0.026
• D. none

Answer 1

Answer: (C)

1.42 M; 1.489 m; 0.026

Mass of solution = 100 g

mass of KCL = 10 g

Molarity = $\frac{massofKCl\ast density\ast 1000}{molecularmass\ast massofsolution}$

molarity = 1.42 M

so, option C is correct answer