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Q.

The boiling point elevation constant for toluene is 3.32 K kg mol-1 . The normal boiling point of toluene is 110.7oC. The enthalpy of vaporisation of toluene would be nearly:

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a

17.0 kJ mol-1

b

34.0 kJ mol-1

c

51.0 kJ mol-1

d

68.0 kJ mo1-1

answer is B.

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Detailed Solution

ΔHvap. =Msolvent ×R×Tb (solvent) e 21000×Kb∴ΔHvap. =92×8.314×(383.7)21000×3.32=33.91kJ/mol≈34kJ/mol
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