At 280^°C, the Vapor Pressure of N-Propyl Mercaptan, C₃H₇SH, Is 175

Multiple Choice

At 28.0^°C, the vapor pressure of n-propyl mercaptan, C₃H₇SH, is 175 torr, while that ofacetonitrile, CH₃CN, is 102 torr. What is the vapor pressure, at 28.0°C, of a solution made bymixing 80.0 g of C₃H₇SH and 120.0 g CH₃CN, if Raoult's Law is obeyed?Hint: Organizing the given information into moles and mole fraction of each component will help in solving this problem.

A) 121 torr
B) 131 torr
C) 139 torr
D) 146 torr
E) 156 torr