Determine the vapor pressure of a solution at 55°C that contains 34.2 g NaCl in 375 mL of water.The vapor pressure of pure water at 55°C is 118.1 torr.The van't Hoff factor for NaCl is 1.9.
A) 115 torr
B) 87.1 torr
C) 108 torr
D) 112 torr
E) 92.8 torr

Question

Quizplus · Accepted Answer

The vapor pressure of the solution is calculated using Raoult's Law: P_solution = X_solvent * P_pure solvent. First, calculate the mole fraction of the solvent (water) considering the van't Hoff factor for NaCl. The mole fraction of water is approximately 0.949, leading to a vapor pressure of about 112 torr.

Determine the Vapor Pressure of a Solution at 55°C That