Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of nonvolatile solute in 275 g of hexane (M = 86.18 g/mol) at 49.6 degrees Celsius. P(pure hexane) = 400.0 torr at 49.6 degrees Celsius. A 54 B 154 torr C 246 torr D 346 torr E 400 torr