A sample of oxygen gas is collected over water at 23 °C at a barometric pressure of 751 mmHg (the vapor pressure of water at 23 °C = 21 mmHg).The partial pressure of oxygen gas in the sample collected is ________.
A)0.96 atm
B)21 mmHg
C)751 mmHg
D)1.02 atm
E)44 mmHg

Question

Quizplus · Accepted Answer

The partial pressure of oxygen gas is found by subtracting the vapor pressure of water from the total pressure. Thus, 751 mmHg - 21 mmHg = 730 mmHg. Converting this to atm (using 760 mmHg = 1 atm), we get 730 mmHg * (1 atm / 760 mmHg) ≈ 0.96 atm.

A Sample of Oxygen Gas Is Collected Over Water at 23