InterviewSolution
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InterviewSolution
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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 beA. 127.2B. 131.2C. 137.12D. 142.72 |
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Answer» Correct Answer - B `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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