Question

A solution is prepared by dissolving 20 g NaOH in 1250 mL of a solvent of density 0.8 g/mL. Then the molality of the solution is

• A. 0.2 mol kg\(^{-1}\)
• B. 0.08 mol kg\(^{-1}\)
• C. 0.25 mol kg\(^{-1}\)
• D. 0.0064 mol kg\(^{-1}\)
• E. 0.5 mol kg\(^{-1}\)

Hint:

Molality uses mass of solvent in kg, not volume of solution.

Answer 1

Answer: (E)