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Question
The empirical formula of a compound is C2H5. Its vapour density is 29. Determine the relative molecular mass of the compound and hence its molecular formula.
Solution
Given the empirical formula of the compound is C2H5.
Vapour density is = 29 .
Empirical formula mass of the compound = 29
As, molecular mass = 2 x vapour density = 2 x 29 = 58
So, molecular mass of the compound =58
Molecular formula = n x Empirical formula
Now, n = Molecular mass/ Empirical formula mass = 58/ 29 =2
Molecular formula = 2 x (C2H5 ) = C4H10
So, molecular formula of compound is = C4H10
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