InterviewSolution
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InterviewSolution
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The `E^(@)` values for the changes given below are measured againest `NHE` at `27^(@)C`. `Cu^(2+) + e rarr Cu^(+), E^(@) = + 0.15 V`, `Cu^(+) + e rarr Cu, E^(@) = + 0.50 V`, `Zn^(2+) + 2e rarr Zn, E^(@) = - 0.76 V` The temperature coefficient of emf a cell designed as `Zn"|"underset(1 M)(Zn^(2+))"||"underset(0.1 M)(Cu^(2+))"|"Cu` is `-1.4 xx 10^(-4)V` per degree. For a cell reaction in equilibrium `DeltaG = 0` and `DeltaG^(@) = -2.303 RTlog_(10)K_(c)`. The heat of reaction and entropy change during the reaction are are related by `DeltaG = DeltaH - TDeltaS`. Change in entropy for the reaction : `Zn+underset(0.1 M)(Cu^(2+)) hArrunderset(1M)(Zn^(2+))+Cu` at `27^(@)C` is :A. `14 J`B. `27 J`C. `-14 J`D. `-27 J` |
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Answer» Correct Answer - D `DeltaG = DeltaH - TDeltaS` `-2.037 xx 10^(5) = -2.118 xx 10^(5) -300 xx DeltaS` `DeltaS = -27J` |
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