Q.

If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio 2:1 and their enthalpy of varporisation are in the ratio 1:2, then the boiling point elevation constant of X is m times the boiling point elevation constant of Y. The value of m is …….(nearest integer)

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answer is 8.

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Detailed Solution

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KbxKby=RT02m100ΔHvx1000ΔHVRT02myT0x:T0y=2:1ΔHvapx:ΔHvapy=1:2kbxkby=(2)2×21×1=8

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