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

Question:

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 35ºC and its heat of vaporization is 27.5 kJ/ mol. What is the entropy of vaporization for this substance?