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Question

A cylinder of a gas mixture used for calibration of air analyzers in laboratories contains 13.22% oxygen, 23.02% argon, and the remainder helium at a total pressure of 172.74 mmHg. What is the partial pressure of each component of this gas? (The percentages given indicate the percent of the total pressure that is due to each component.)

_________mmHg oxygen

_________mmHg argon

________mmHg helium

Answer 1

The partial pressure of each gas is simply the total pressure x the % for each gas.

The % for helium is 100% - the sum of the other gases.

%He = 100 - (13.22 + 23.02) = 63.76%

Partial pressure of oxygen = 13.22% x 172.74 mm Hg = 22.84 mm Hg

Partial pressure of argon = 23.02% x 172.74 mm Hg = 39.76 mm Hg

Partial pressure of helium = 63.76% x 172.74 mm Hg = 110 mm Hg