A gas mixture with a total pressure of 740 mmhg contains, Chemistry

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A gas mixture with a total pressure of 740 mmhg contains

A gas mixture with a total pressure of 740 mmHg contains the following gases at the indicated partial pressures: CO2= 115 mmHg; Ar= 220 mmHg and O2=150 mmHg. The remaining gas in the mixture is helium. What is the mole fraction of helium gas in this sample?

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Chemistry: A gas mixture with a total pressure of 740 mmhg contains

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