At 28.0 degrees C, the vapor pressure of n-propyl mercaptan C3H7SH is 175 torr, while that of acetonitrile, CH3CN is 102 torr. What is the vapor pressure, at 28 degrees C, of a solution made by mixing 80.0 g of C3H7SH and 120.0 g of CH3CN, if Raoult's Law is obeyed? (please show how to work the problem so I can better understand)