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2 December, 13:06

A sample of gas has a mass of 0.673g. Its volume is 250.0mL at a temperature of 83 degrees C and a pressure of 747 torr. The sample is composed of which of the following gases?

(A) Xe

(B) Ar

(C) SO3

(D) CO2

(E) H2

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  1. 2 December, 13:18
    0
    Given dа ta:

    Mass of sample = 0.673 g

    Volume = 250.0 mL (0.25 L)

    Temperature = 83°C (273+83 = 356 k)

    Pressure = 747 torr (747/760 = 0.98 atm)

    Gas type = ?

    Solution:

    PV = nRT

    n = PV/RT

    n = 0.98 atm * 0.25 L / 0.0821 atm. L/mol. K * 356 k

    n = 0.245 / 29.23/mol

    n = 0.01 mol

    Number of moles = mass / molar mass

    Molar mass = 0.673 g / 0.01 mol

    Molar mass = 67.3 g/mol

    molar mass of CO2 = 44 g/mol

    molar mass of H2 = 2.016 g/mol

    molar mass of SO3 = 80.066 g/mol

    molar mass of Ar = 40 g/mol

    molar mass of Xe = 131.3 g/mol

    So non of these gases are present.
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