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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank First law of thermodynamics and Hess law

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    For the reaction, \[{{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\to \,\,3C{{O}_{2}}(g)+4{{H}_{2}}O(l)\] at constant temperature, \[\Delta H-\Delta E\] is              [CBSE PMT 2003]

    A)                 ? RT      

    B)                 + RT

    C)                 ? 3RT    

    D)                 + 3RT

    Correct Answer: C

    Solution :

           \[\Delta H-\Delta E=\Delta nRT\] ; \[\Delta n=-3\]                                 so, \[\Delta H-\Delta E=-3RT\].


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