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8 March, 12:01

Determine the molar mass of freon-11 gas if a sample weighing 0.597 g occupies 100. cm3 at 95°c, and 1,000. mmhg (r = 0.08206 l • atm/k • mol, 1 atm = 760 mmhg).

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  1. 8 March, 13:27
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    We can first find the number of moles using the ideal gas law equation,

    PV = nrT

    where P - pressure - 1000 mmHg / 760 mmHg/atm = 1.32 atm

    V - volume - 100 x 10⁻³ L

    n - number of moles

    r - universal gas constant - 0.08206 LatmK⁻¹mol⁻¹

    T - temperature in Kelvin - 95 °C + 273 = 368 K

    substituting these values

    1.32 atm x 100 x 10⁻³ L = n x 0.08206 LatmK⁻¹mol⁻¹ x 368 K

    n = 0.00437 mol

    molar mass can be determined as follows

    molar mass = mass present / number of moles

    molar mass = 0.597 g / 0.00437 mol = 136.6 g/mol

    molar mass of gas is 137 g/mol
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