A solution is 40.0% by mass benzene (C₆H₆)in carbon tetrachloride (CCl₄)at 20°C.The vapor pressure of pure benzene and pure carbon tetrachloride at this temperature is 74.61 mmHg and 91.32 mmHg, respectively.Calculate the vapor pressure of the solution at 20°C: A)66.4 mmHg B)73.8 mmHg C)81.8 mmHg D)83.0 mmHg E)84.6 mmHg

Question

Quizplus · Accepted Answer

The vapor pressure of the solution can be calculated using Raoult's Law: P_solution = X_benzene * P_benzene + X_CCl4 * P_CCl4. First, calculate the mole fractions: X_benzene = 0.40 and X_CCl4 = 0.60. Then, P_solution = (0.40 * 74.61 mmHg) + (0.60 * 91.32 mmHg) = 81.8 mmHg.

A Solution Is 40