A gas mixture with a total pressure of
A gas mixture with a total pressure of 765 mmHg contains each of the following gases at the indicated partial pressures: CO2, 127 mmHg ; Ar, 206 mmHg ; and O2, 189 mmHg . The mixture also contains helium gas. What mass of helium gas is present in a 11.3-L sample of this mixture at 273 K ?
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