A solution is prepared by mixing 75 g of benzene (C₆H₆) with 25 g of toluene (C₇H₈). Use the following data to determine the vapor pressure of this solution at 20 $\circ$ C. A)63 torr B)49 torr C)87 torr D)35 torr E)71 torr

Question

Quizplus · Accepted Answer

Raoult's law states that the vapor pressure of a solution is equal to the sum of the vapor pressures of the pure components multiplied by their mole fractions in the solution. The mole fraction of benzene in the solution is 75 g / (75 g + 25 g) = 0.75. The mole fraction of toluene in the solution is 25 g / (75 g + 25 g) = 0.25. The vapor pressure of the solution is therefore 0.75 * 75 torr + 0.25 * 22 torr = 63 torr.

A Solution Is Prepared by Mixing 75 G of Benzene ∘\circ∘

A Solution Is Prepared by Mixing 75 G of Benzene $\circ$