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The weight ratio of elements carbon, nit...

The weight ratio of elements carbon, nitrogen and hydrogen in a compound of molecular mass 108 is `18:2:7`. What is its molecular formula? 

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`C:H:N=(18)/(12):(2)/(1):(7)/(14)=3:4:1`
Empirical formula is `C_(3)H_(4)N`
Empirical formula weight = 54
`n=(108)/(54)=2`
 Molecular formula `=2xx(C_(3)H_(4)N)=C_(6)H_(8)N_(2)`
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