Which compound is likely to have a higher molar heat ofvaporization? { 1-propano

Question

Which compound is likely to have a higher molar heat ofvaporization? { 1-propanol or Propane 1-thiol} Select the most important reason for your answer above is it A: Hydrogenbonding                                         D. Stronger hydrogen bonding and Weaker. B: Short chain and longChain                             E. Weaker Hydrogen bonding and Stronger. C: Long Chain and shortChain                           F. Lack of Hydrogen Bonding. Which compound is likely to have a higher molar heat ofvaporization? { 1-propanol or Propane 1-thiol} Select the most important reason for your answer above is it A: Hydrogenbonding                                         D. Stronger hydrogen bonding and Weaker. B: Short chain and longChain                             E. Weaker Hydrogen bonding and Stronger. C: Long Chain and shortChain                           F. Lack of Hydrogen Bonding.

Explanation / Answer

The enthalpy of vaporization can be viewed as the energyrequired to overcome the intermolecular interactions in the liquid(or solid, in the case of sublimation).Thus the molecule withgreater intermolecular forces have the greater heat ofvaporization. In the given two compounds 1- propanol has the greaterinter molecualr forces compare with the propane-1-thiol ,thus1-propanol has the greater molar heat of vaporization.The reasonfor this is the containing of the hydrogen bonding between theatoms.

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