The boiling point of pure benzene at 760. torr is 80.1°C. What is the vapor pressure of benzene over a solution containing 4.60 mol of nonvolatile hydrocarbon and 11.60 mol of benzene at 80.1°C? A) 6.43*10² torr B) 5.44 * 10² torr C) 2.16 *10² torr D) 7.60 * 10² torr E) 1.51 * 10² torr

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Quizplus · Accepted Answer

The vapor pressure of benzene over the solution can be calculated using Raoult's Law: P_solution = X_benzene * P_pure_benzene. The mole fraction of benzene, X_benzene, is 11.60 / (11.60 + 4.60) = 0.716. Therefore, P_solution = 0.716 * 760 torr = 544 torr.

The Boiling Point of Pure Benzene at 760