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21 April, 07:54

The density of an unknown gas is found to be 3.44 g/l at standard temperature and pressure (stp). what is the molar mass of this gas? 32 g/mol 48 g/mol 64 g/mol 77 g/mol

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  1. 21 April, 08:16
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    To calculate the molar mass of a gas, without knowing density, we would alter the equation:

    PV = (mass / molar mass) (RT)

    we know density and the units are mass / volume

    altering the equation to accommodate density

    PV = mass x RT x molar mass ... taking note that mass / volume = density, g/L

    P = dRT / molar mass

    solving for molar mass:

    molar mass = dRT/P

    3.44g/L x 0.0821L-atm/mole-K x 273K / 1atm = molar mass = 77.1g/mole
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