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A gas mixture with a total pressure of 750mmHg contains each of the following gases at the indicated partial pressures:CO2 , 133mmHg ; Ar,215mmHg and O2,177mmHg.The mixture also contains helium gas. What is the partial pressure of the helium gas? PHe=?mmHg What mass of helium gas is present in a 12.2-L sample of this mixture at 275K ?m=?g

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