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A carbon compound contains 12.8% Carbon,...

A carbon compound contains 12.8% Carbon, 2.1% Hydrogen, 85.1% Bromine. The molecular weight of the compound is 187.9. Calculate the molecular formula.

Text Solution

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`:.` Empirical formual of the compound `=C_(1)H_(2)Br_(1)`
Empirical formual weight `=1xxC+2xxH+1xxBr=1xx12+2xx1+1xx80=94`
Molecular weight `=187.9`
`:.n=("Molecular weight")/("Empirical formula weight")=187.9/94=2`
Molecular formula =Empirical formula `xxn=C_(1)H_(2)Br_(1)xx2=C_(2)H_(4)Br_(2)`
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