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Kelli
Kelli asked in Science & MathematicsChemistry · 5 years ago

An experiment shows that a 115 mL gas sample has a mass of 0.170 g at a pressure of 701 mmHg and a temperature of 31 ∘C.?

What is the molar mass of the gas?

2 Answers

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  • KennyB
    Lv 7
    5 years ago

    First find moles:

    n = PV/RT

    P = 701 mm

    V = 0.115 L

    T = 304 K (you must use degrees K)

    You need a value of R in L-torr/deg-mol and the answer will be in moles.

    Divide the mass by the moles and you have g/mol which is the molar mass.

  • Roger the Mole
    Lv 7
    5 years ago

    n = PV / RT = (701 mmHg) x (0.115 L) / ((62.36367 L mmHg/K mol) x (31 + 273) K) = 0.00425 mol

    (0.170 g) / (0.00425 mol) = 40.0 g/mol

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