1.

A solution containing 3.3 g of a substance in 125g of benzene (b.p 80^(@)C) boils at 80.66^(@)C. If K_(b) for one litre of benzene is 3.28^(@)C, the molecular mass of the substance shall be

Answer»

127.2
131.2
137.12
142.72

Solution :`Delta T_(b) = (K_(b) XX W_(2))/(M_(2) xx W_(1))=1000` `:. M_(2) = (1000K_(b) W_(2))/(W_(1) Delta T_(b))=(1000 xx 3.28 xx 3.3)/(125 xx 0.66)=131.2`


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