InterviewSolution
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InterviewSolution
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`A + B rarr C+D, Delta H = -10,000 J mol^(-1) , Delta S = - 33.3 J mol^(-1) K^(-1)` (i) At what temperature the reaction will occur spontaneously from left to right ? (ii) At what temperature , the reaction will reverse? |
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Answer» `Delta G = DeltaH -T DeltaS` At equilibrium , `Delta G =0` so that `Delta H = T Delta S` or `T = (DeltaH)/(DeltaS) = (- 10000J mol^(-1))/( - 33.3JK^(-1)mol^(-1))= 300.3K` (i) For spontaneity from left to right, `Delta G` should be -ve for the given reaction. This willbe so if `T lt 300.3K` ( becasue `Delta H` and `Delta S` both are -ve ) (ii) For reverse reaction to occur, `Delta G` should be `+` be for forward reaction. This will be so if `T gt 300.3` K. |
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