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At 20 ^circ {rm C} the vapor pressure of benzene ({rm{C}}_6 {rm{H}}_6 ) is 75 rm torr, and that of toluene ({rm{C}}_7 {rm{H}}_8 ) is 22 rm torr. Assume that benzene and toluene form an ideal solution.What is the composition in mole fractions of a solution that has a vapor pressure of 37 torr at 20 ^circ {rm C}?

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