For a reaction in a voltaic cell both D H° and D S° are negative. Which of the f

ID: 920574 • Letter: F

Question

For a reaction in a voltaic cell both DH° and DS° are negative. Which of the following statements is true?

a. E°cell will increase as the temperature increase.

b. E°cell will decrease as temperature increases..

c. E°cell will not change with an increase in temperature.

d. E° > 0 for all temperatures.

If possible, please provide a detailed solution to accompany your answer.

a. E°cell will increase as the temperature increase.

b. E°cell will decrease as temperature increases..

c. E°cell will not change with an increase in temperature.

d. E° > 0 for all temperatures.

delta G = delta H - ( T x delta S)

T = Temperature

Given,

delta H and delta S are negative.

Therefore as T increases, delta G also increases.

We know that,

delta G = - nFEo cell

=> Eo cell = - delta G / n F

As delta G increases, Eo cell decreases (due to -ve sign)

Therefore,

As T increases, delta G increases and Eo cell decreases

b) Eo cell will decrease as tempreature increases

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