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NEET Sample Paper NEET Sample Test Paper-82

  • question_answer
    What will be the temperature at which liquid and vapour of water will be at equilibrium with each other? Given data are \[\Delta {{H}_{vap}}=\,\,40.73\,kJ\,mo{{l}^{-}}^{1}\] \[\Delta {{S}_{vap}}=\,\,0.109\,kJ\,mo{{l}^{-}}^{1}{{K}^{-\,1}}\]

    A)  273 K              

    B)  373 K

    C)  \[37{}^\circ  C\]                      

    D)  \[110{}^\circ C\]

    Correct Answer: B

    Solution :

    We know that at equilibrium \[\Delta G = 0\] for given reaction \[{{H}_{2}}O(l)\,\,\,\,{{H}_{2}}O\,(v)\] At equilibrium   \[\Delta G = 0\] \[\Delta H\,\,-T\Delta S=0\] \[\Delta \text{H = T}\Delta \text{S}\] \[T=\frac{\Delta H}{\Delta S}=\frac{40.73\,kJ\,mo{{l}^{-\,1}}}{0.109\,kJ\,mo{{l}^{-\,1}}\,\,{{K}^{-\,1}}}\]\[=\,\,\,373\,K\]


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