Barbiturates Are Synthetic Drugs Used as Sedatives and Hypnotics

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

A) 117.0°C
B) 117.7°C
C) 118.1°C
D) 118.8°C
E) >120°C