Benzene, C₆H₆, and toluene, C₆H₅CH₃, form an ideal solution. The vapor pressure of benzene is 94.6 Torr and that of toluene is 29.1 Torr at 25°C. Calculate the total vapor pressure of each of the following solutions and the mole fraction of each substance in the vapor phase above those solutions at 25°C:

(a) 1.50 mol C₆H₆ mixed with 0.50 mol C₆H₅CH₃;

(b) 15.0 g of benzene mixed with 64.3 g of toluene.