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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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`therefore` Empirical formula of the compound = `C_1H_2Br_1`
Empirical formula weight = `1xx C+2xx H +1xxBr`
`=1xx12+2xx1+1xx80=94`
Molecular weight = 187.9
`therefore` n= `("Molecular weight")/("Empirical folmula weight")=(187.9)/(94)=2`
Molecular formula = Empirical formula `xx` n
=`C_1H_2Br_1xx2=C_2H_4Br_2` .
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