The vapor pressure of water at 45.0 °C is 71.93 mmHg.Calculate the vapor pressure of a solution of 1.25m Al(ClO₃)₃ at this temperature (assume 100% dissociation) A)360.mmHg B)89.9 mmHg C)71.9 mmHg D)70.4 mmHg E)66.0 mmHg

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Quizplus · Accepted Answer

The vapor pressure of the solution is lower than that of pure water due to the presence of solute particles. Al(ClO3)3 dissociates into 4 ions (1 Al^3+ and 3 ClO3^-), so the van't Hoff factor (i) is 4. The mole fraction of the solvent is reduced by the presence of solute, and Raoult's Law is used to calculate the new vapor pressure: P_solution = X_solvent * P_pure. The mole fraction of water is approximately 0.833, leading to a vapor pressure of about 66.0 mmHg.

The Vapor Pressure of Water at 45