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2 December, 02:12

What is the molecular weight of a gas if a 12.0 g sample has a pressure of 836 mm Hg at 25.0°C in a 2.00 L flask? (R = 0.0821 L atm / mol K)

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  1. 2 December, 02:45
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    Answer: 133.3g/mol

    Explanation:

    Mass = 12g

    V = 2L

    R = 0.0821 L atm / mol K

    P = 836mmHg = 836/760 = 1.1atm

    T = 25°C = 25 + 273 = 298K

    n = ?

    n = PV / RT = (1.1x2) / (0.0821x298)

    n = 0.09

    Molar Mass = Mass / n

    Molar Mass = 12/0.09

    Molar Mass = 133.3g/mol
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