The normal boiling point of liquid W is lower than that of X, which is lower than that of Y. Which of the following is the correct order of increasing vapor pressure of the thee liquids at STP?
A) Y, X, W
B) X, W, Y
C) W, Y, X
D) W, X, Y
E) X, Y, W

Question

Quizplus · Accepted Answer

According to the Clausius-Clapeyron equation, substances with lower boiling points have higher vapor pressures at a given temperature. Therefore, Y has the highest boiling point and the lowest vapor pressure at STP, followed by X and then W. Thus, the correct order of increasing vapor pressure is Y < X < W, which corresponds to choice letter A.

The Normal Boiling Point of Liquid W Is Lower Than