Partial Pressure

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[amiv4]

A gas mixture with a total pressure of 765 mmHg contains each of the following gases at the indicated partial pressures:CO_2, 265  mmHg;  Ar, 123 mmHg}; and O_2, 163 mmHg}. The mixture also contains helium gas.

What mass of helium gas is present in a 11.7 L sample of this mixture at 277 K?

[Otis]

Total pressure is equal to the sum of the partial pressures of each gas (Dalton's Law).
   
So, determine partial pressure of He.

Use PV = nRT

Determine moles of He then mass.

Make sense?

Otis