In the accompanying chart are approximate vapor pressures for benzene and toluene at various temperatures. Benzene

Temp C/mmHg

30 120
40 180
50 270
60 390
70 550
80 760
90 1010
100 1340

Toluene

Temp C/ mmHg
30 37
40 60
50 95
60 140
70 200
80 290
90 405
100 560
110 760

Required:
a. What is the mole fraction of each component if 3.9 g of benzene (C6H6) is dis- solved in 4.6 g of toluene (C7H8)?
b. Estimate to the nearest degree the temperature at which the vapor pressure of the solution equals 1 atm (bp of the solution).
c. Calculate the composition of the vapor (mole fraction of each component) that is in equilibrium in the solution at the boiling point of this solution.
d. Calculate the composition in weight percentage of the vapor that is in equilibrium with the solution..