**Practice Problem 7**

Determine the molecular weight of acetic acid if a solution
that contains 30.0 grams of acetic acid per kilogram of water
freezes at -0.93^{o}C. Do these results agree with the
assumption that acetic acid has the formula CH_{3}CO_{2}H?

**Answer**

60 g/mol; This is in agreement with the
molecular weight expected if the formula for acetic acid is CH_{3}CO_{2}H.