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If the E(cell)^(@) for a given reaction ...

If the `E_(cell)^(@)` for a given reaction has a positive value, then
which of the following gives the correct relationship for the values
of `DeltaG^(@)` and `K_(eq)` :-

A

`DeltaG^(@)lt0,K_(eq)lt1`

B

`DeltaG^(@)gt0,K_(eq)gt1`

C

`DeltaG^(@)gt0,K_(eq)lt1`

D

`DeltaG^(@)lt0,K_(eq)gt1`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the relationship between \(\Delta G^\circ\) and \(K_{eq}\) when \(E_{cell}^\circ\) is positive, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Relationship Between \(\Delta G^\circ\) and \(E_{cell}^\circ\)**: The relationship is given by the equation: \[ \Delta G^\circ = -nFE_{cell}^\circ \] where: - \(n\) = number of moles of electrons transferred in the reaction (always positive), - \(F\) = Faraday's constant (approximately 96500 C/mol, also positive), - \(E_{cell}^\circ\) = standard cell potential. 2. **Analyze the Sign of \(\Delta G^\circ\)**: Since \(E_{cell}^\circ\) is given as positive, and both \(n\) and \(F\) are positive, the product \(nFE_{cell}^\circ\) is also positive. Therefore: \[ \Delta G^\circ = -nFE_{cell}^\circ < 0 \] This means that \(\Delta G^\circ\) is negative. 3. **Understand the Relationship Between \(\Delta G^\circ\) and \(K_{eq}\)**: The relationship is given by: \[ \Delta G^\circ = -2.303RT \log K_{eq} \] where: - \(R\) = universal gas constant (positive), - \(T\) = temperature in Kelvin (positive). 4. **Analyze the Sign of \(K_{eq}\)**: Since we have already established that \(\Delta G^\circ < 0\), we can substitute this into the equation: \[ -2.303RT \log K_{eq} < 0 \] Since \(-2.303RT\) is negative (as \(R\) and \(T\) are positive), for the entire expression to be negative, \(\log K_{eq}\) must be positive. Thus: \[ \log K_{eq} > 0 \] This implies that: \[ K_{eq} > 1 \] 5. **Conclusion**: Therefore, when \(E_{cell}^\circ\) is positive, \(\Delta G^\circ\) is negative, and \(K_{eq}\) is greater than 1. ### Final Answer: The correct relationship is: \[ \Delta G^\circ < 0 \quad \text{and} \quad K_{eq} > 1 \]

To solve the question regarding the relationship between \(\Delta G^\circ\) and \(K_{eq}\) when \(E_{cell}^\circ\) is positive, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Relationship Between \(\Delta G^\circ\) and \(E_{cell}^\circ\)**: The relationship is given by the equation: \[ \Delta G^\circ = -nFE_{cell}^\circ ...
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