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18 April, 02:42

5. If 1 g of a gas occupies a volume of 300 mL at STP, what is the molecular weight of the gas?

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  1. 18 April, 05:51
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    74,67 gr/mol

    Explanation:

    At STP 1 mole of an ideal gas has volume of 22,4 L. Since we know the volume of the gas we can find the number of moles of the gas. (300 mL=0,3 L)

    n=0,3L/22,4 L=0,01339 mol

    Since we know weight of the gas as 1 g, we can find the molecular weight as;

    MW=1 g/0,01339 mol = 74,67 gr/mol
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