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A sample of natural gas is 85.2% methane, CH4, and 14.8% ethane, C2H6, by mass. What is the density of this gas mixture at 18.0°C and 771 mmHg? Assume ideal gas behavior.

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    I would calculate an "average" molar mass.
    Take a 1 g sample you will have 0.852g CH4 and 0.148 g C2H6.
    (0.852 x molar mass CH4) + (0.148 x molar mass C2H6) = molar mass of the mixture.
    Then P*molar mass = dRT
    d = density in g/L.

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