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A sample of natural gas is 85.2% methane...

A sample of natural gas is 85.2% methane and 14.8 % ethane by mass. What is the density of this mixute at `18^(@)C` and 784 mm Hg ?

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Verified by Experts

The correct Answer is:
`0.74 g L^(-1)`
Molecular mass of mixture,
`M = (85.2)/(100) xx 16 + (14.8)/(100) xx 30 = 13.632 + 4.44 = 18.07`
`PM = dRT`
`d = (PM)/(RT) = (748)/(760) xx (18.07)/(0.0821 xx 291) = 0.74 g L^(-1)`
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