## Chemistry and Chemical Reactivity (9th Edition)

The mole fraction of toluene in solution: $1.0/(1.0+2.0)=0.33$ The mole fraction of benzene in solution: $1-0.33=0.67$ Total pressure: $P=P_A^0X_A+P_B^0X_B=22\times0.33+75\times0.67=57.51\ mmHg$ The mole fraction of toluene in vapor: $22\times0.33/57.51=0.13$ The mole fraction of benzene in vapor: $1-0.13=0.87$