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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Free energy and work function

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    The equilibrium concentration of the species in the reaction \[A+B\equiv C+D\] are 3, 5, 10 and 15 \[mole\,{{L}^{-1}}\] respectively at \[300\,K\] the \[\Delta G\] for the reaction is       [Pb. PMT 2004]

    A)                 13.81    

    B)                 ? 1381.8

    C)                 ? 138.18              

    D)                 1391.6

    Correct Answer: B

    Solution :

               \[\Delta G=-2.303\,RT\,\log \,{K}'\], Here \[R=2\,cal,\,\,T=300K\]                    \[{K}'=\frac{10\times 15}{3\times 5}=10\];  \[\Delta G=-2.303\times 2\times 300\times {{\log }_{10}}10\]                                 \[=-2.303\times 2\times 300\times 1=-1381.8\,cal\]


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