Chemical Thermodynamics Question 459

Question: The enthalpy change for the transition of liquid water to steam, $ \Delta H_{vap}=37.3,kJ,mo{{l}^{-1}} $ at $ 373,K $ . The entropy change for the process is

Options:

A) $ 111.9,J,mo{{l}^{-1}}{{K}^{-1}} $

B) $ 37.3,J,mo{{l}^{-1}},{{K}^{-1}} $

C) $ 100,J,mo{{l}^{-1}}{{K}^{-1}} $

D) $ 74.6,J,mo{{l}^{-1}}{{K}^{-1}} $

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Answer:

Correct Answer: C

Solution:

  • $ \Delta S_{vap}=\frac{\Delta H_{vap}}{T}=\frac{37.3,KJ,mo{{l}^{-1}}}{373K} $

$ =0.1,kJ,mo{{l}^{-1}},{{K}^{-1}} $

$ =100J,mo{{l}^{-1}},{{K}^{-1}} $ .



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