A gas is collected over water at a certain temperature. The total pressure is 758 torr. The vapor pressure of water at this temperature is 17 torr. The partial pressure of the gas collected is
A) 758 torr
B) 17 torr
C) 775 torr
D) 741 torr
E) 733 torr

Question

Quizplus · Accepted Answer

The partial pressure of the gas collected is calculated by the difference between total pressure and vapor pressure of water:

Partial pressure of gas = Total pressure - Vapor pressure of water 
Partial pressure of gas = 758 torr - 17 torr 
Partial pressure of gas = 741 torr

Therefore, the correct answer is D) 741 torr.

A Gas Is Collected Over Water at a Certain Temperature