A Petroleum Company Separates Benzene (78 G/mol) and N-Octane (114

Multiple Choice

A petroleum company separates benzene (78 g/mol) and n-octane (114 g/mol) by distillation. In one run, the starting solution was 15% benzene and 85% n-octane by mass at 25°C. In the liquid, the mole ratio of benzene to n-octane was ________, and in the vapor it was ________. The vapor pressures for benzene and n-octane at this temperature are 11 torr and 95 torr, respectively.

A) 0.26; 0.12
B) 0.18; 0.12
C) 0.80; 0.20
D) 0.26; 0.18
E) 0.31; 0.23