A) \[42\,J\,mo{{l}^{-1}}{{K}^{-1}}\]
B) \[21\,J\,mo{{l}^{-1}}{{K}^{-1}}\]
C) \[84\,J\,mo{{l}^{-1}}{{K}^{-1}}\]
D) \[8.4\,J\,mo{{l}^{-1}}{{K}^{-1}}\]
Correct Answer: D
Solution :
Key Idea:\[\Delta S=\frac{\Delta H}{T}\] \[where\,\Delta S\,=entropy\,of\,vaporisation.\] \[\Delta H=enthalpy\,of\,vaporisation\,=840\,J/mol\] \[T=-173{{\,}^{o}}C=-173+273=100\,K\] \[\therefore \] \[\Delta S=\frac{840}{100}=8.4\,J\,mo{{l}^{-1}}{{K}^{-1}}\]You need to login to perform this action.
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