A solution is made by adding 0.100 mole of ethyl ether to 0.491 mole of ethyl alcohol.If the vapor pressure of ethyl ether and ethyl alcohol at 20°C are 375 torr and 20.0 torr,respectively,the vapor pressure of the solution at 20°C (assuming ideal behavior)is:
A)80.1 torr
B)315 torr
C)46.8 torr
D)395 torr
E)none of these

Question

Quizplus · Accepted Answer

Raoult's law: P(total) = P(ether) + P(alcohol) = X(ether) * P(ether)^o + X(alcohol) * P(alcohol)^o                                                                 = 0.100/0.591 * 375 torr + 0.491/0.591 * 20.0 torr                                                                 = 80.1 torr

A Solution Is Made by Adding 0