. A gaseous hydrocarbon contains 82.76% of carbon

A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular formula.

Best Answer

% of carbon = 82.76%

% of hydrogen = 100 - 82.76 = 17.24%

Empirical formula = C₂H₅

Empirical formula weight = 2 x 12 + 1 x 5 = 24 + 5 = 29

Vapour Density = 29

Relative molecular mass = 29 x 2 = 58

N =

Molecular formula = n x empirical formula

= 2 x C₂H₅

= C₄H₁₀

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