gas mixture with a total pressure of 765 mmHg contains each of the following gases at the indicated partial pressures: 131 mmHg CO2, 226 mmHg Ar, and 186 mmHg O2. The mixture also contains helium gas. what is the partial pressure of the helium gas

322mmHg

Explanation:

To calculate the partial pressure of the helium gas, we use the Dalton's law of partial pressure.

It states that for a mixture of gases which do not react, the total pressure is equal to the sum of the individual partial pressures.

This means that:

Total pressure = Partial pressure of CO2 + partial pressure of Ar + Partial pressure of O2 + Partial pressure of helium.

Hence, Partial pressure of the helium gas = 765-131-226-86 = 322 mmHg