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A certain gaseous organic compound effus...

A certain gaseous organic compound effuses about half as fast as neon. What is the molar mass of the compound?

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`(" Rate of effusion of unknown compound ")/(" Rate of effusion of He ")= sqrt((4g mol^(-1))/(M)) approx (1)/(2)`
Methane, `CH_(4)`, molar mass `= 16g mol^(-1)`.
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