The vapor pressure of water at 45.0 ^$\circ$C is 71.93 mmHg. What is the vapor pressure of water over a solution prepared from 75.0 g of citric acid (C₆H₈O₇) in 0.420 kg of water at this temperature A) 1.22 mmHg B) 42.3 mmHg C) 43.0 mmHg D) 70.7 mmHg E) 73.2 mmHg

Question

Quizplus · Accepted Answer

The vapor pressure of the solution can be calculated using Raoult's Law, which states that the vapor pressure of a solution is directly proportional to the mole fraction of the solvent. Since citric acid (C6H8O7) does not dissociate in water, it will lower the vapor pressure of the solution compared to pure water. The calculation involves determining the moles of citric acid and water, calculating the mole fraction of water, and then applying Raoult's Law to find the new vapor pressure. The closest answer to the calculated value, considering the mole fraction of water in the solution, is 70.7 mmHg.

The Vapor Pressure of Water at 45 ∘\circ∘ C Is 71

The Vapor Pressure of Water at 45 $\circ$ C Is 71