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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((4 g mol^(-1))/(M)) = (1)/(2)`
Methane , `CH_(4)` , molar mass = 16 g `mol^(-1)`
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