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    The mass of hydrogen gas is "27 g" You are asked to determine the mass of a gas in a weather balloon filled with hydrogen, therefore, the gas is hydrogen gas, "H"_2 First you need to determine the moles of hydrogen gas at STP by using the ideal gas law Once you know moles, you will determine the mass by multiplying by the moles by the molar mass of "H"_2" ("2 016 g mol") Equation for the





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