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Anonymous asked in Science & MathematicsChemistry · 9 years ago

1)An experiment shows that a 111 mL gas sample has a mass of 0.172 g at a pressure of 739 mmHg and a temperatu?

1)An experiment shows that a 111 mL gas sample has a mass of 0.172 g at a pressure of 739 mmHg and a temperature of 31 degrees C. What is the molar mass of the gas. I got down to moles on this one... But don't know if I did it right.

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  • a2gal
    Lv 7
    9 years ago
    Favorite Answer

    convert C to K:

    31 C + 273 = 304 K

    PV = nRT

    739 mmHg (0.111 L) = n (62.36 L mmHg/mol K) (304 K)

    0.0043 mol = n

    find molar mass by dividing mass by moles:

    0.172 g/0.0043 mol = 39.8 g/mol

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