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Ethanethiol (C2H5SH; also called ethyl mercaptan) is commonly added to natural gas to provide the “rotten...

Ethanethiol (C2H5SH; also called ethyl mercaptan) is commonly

added to natural gas to provide the “rotten egg” smell

of a gas leak. The boiling point of ethanethiol is 358C and its

heat of vaporization is 27.5 kJ/mol. What is the entropy of

vaporization for this substance?

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Answer #1

Given that,

Boiling point = 350C = 308 K

Heat of vaporisation = 27.5 kJ/mol

Entropy of vaporization = heat of vaporization / boiling point

deltaSvap = 27.5 / 308 = 0.0893 kJ/K.mol = 89.3 J/K.mol

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