Question

Challenge Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen, 21 percent oxygen, and 1 percent argon. (There are trace amounts of many other gases in air. If the atmospheric pressure is 760 mmHg, what are the partial pressures of nitrogen, oxygen, and argon in the atmosphere?

Answer 1

The partial pressures of gases in air at 760 mmHg are N₂ (592.8 mmHg), O₂ (159.6 mmHg) and Ar (7.6 mmHg).

What is partial pressure?

Partial pressure is the pressure of a gas in a mixture of gases.

Air is a mixture of gases with 78% N₂, 21% O₂, 1% Ar and other gases in trace amounts. The partial pressure of a gas is proportional to its percentage.

Let's calculate the partial pressures of these gases, considering that the atmospheric pressure is 760 mmHg.

pN₂ = 760 mmHg × 78% = 592.8 mmHg

pO₂ = 760 mmHg × 21% = 159.6 mmHg

pAr = 760 mmHg × 1% = 7.6 mmHg

The partial pressures of gases in air at 760 mmHg are N₂ (592.8 mmHg), O₂ (159.6 mmHg) and Ar (7.6 mmHg).

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