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A gas mixture with a total pressure of 770 mmHg contains each of the following gases at the indicated partial pressures: 121 mmHg CO2, 225 mmHg Ar, and 191 mmHg O2

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A gas mixture with a total pressure of 770 mmHg contains each of the following gases at the indicated partial pressures: 121 mmHg CO2, 225 mmHg Ar, and 191 mmHg O2. The mixture also contains helium gas.

What mass of helium gas is present in a 10.1-L sample of this mixture at 272 K ? ( partial pressure of the helium gas is 233 mmHg)