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Question 32
A reaction is exothermic and has a negative entropy change. Which statement is correct? A The reaction is always feasible B The reaction is feasible above a certain... show full transcript
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Answer
For a reaction to be feasible, we need to consider the Gibbs free energy change, given by:
Where:
In our case, the reaction is exothermic, which means is negative. However, since the entropy change is negative, is also negative.
As the temperature increases, the magnitude of the term becomes significant and can lead to a situation where becomes positive, which indicates that the reaction is not feasible at higher temperatures. Thus, the reaction can only be feasible below a certain temperature. Therefore, the correct statement from the options is:
C: The reaction is feasible below a certain temperature.
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