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8 January, 07:27

A 2.25 g sample of an unknown gas at 63 ∘ C and 1.10 atm is stored in a 1.15 L flask. What is the density of the gas? density: g / L What is the molar mass of the gas? molar mass:

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  1. 8 January, 09:49
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    1. Density = 1.96g/L

    2. Molar Mass of the gas = 42.61g/mol

    Explanation:

    1. Mass = 2.25g

    Volume = 1.15L

    Density = Mass / volume = 2.25/1.15 = 1.96g/L

    2. V = 1.15L

    P 1.10atm

    R = 0.082atm. L/mol / K

    T = 63°C = 63 + 273 = 336K

    n = ?

    PV = nRT

    n = PV/RT = (1.1 x 1.15) / (0.082 x 336)

    n = 0.046mol

    Mass = 1.96g

    n = Mass / Molar Mass

    Molar Mass = Mass / n = 1.96/0.046

    Molar Mass = 42.61g/mol
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