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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 110.7°C. The enthalpy of vaporization of the toluene would be nearly:

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a

51.kJ mol–1

b

68.0 kJ mol–1

c

34.0kJ mol–1

d

17.0kJ mol–1

answer is B.

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Detailed Solution

ΔHvap. =Msolvent ×R×Tb( solvent )o1000×3.32ΔHvap. =92×8.314×(383.7)21000×3.32=33.91kJ/mol34kJ/mol

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