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  1. B

    EK Gen Chem 1001 #187

    If the partial pressure of carbon dioxide is 30torr at STP, and nitrogen is the only other gas present, what is the percent by mass of carbon dioxide? Approach Pressure=760 torr PpCO2=30 torr PpN2=730 torr percent by mass = mass of CO2/total mass of gas The book explains to find mole fraction...