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A compound has the following percentage ...

A compound has the following percentage composition. Carbon 80%, Hydrogen 20%? If the molecular mass is 30, Calculate the molecular formula.

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Empirical formula is `CH_(3)`.
Emperical formula mass `=12 xx 1 + 1 xx 3 =15`
`n=("Molecular mass")/("empericel of formula mass") = 30/15=2`
`therefore MF = C_(2)H_(6)`
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