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Study the following table and, on the basis of these values of $\Delta H$ and $\Delta S$ for five different reactions, predict which one of these will be spontaneous at all temperatures?

(a) Reaction I & III
(b) Reaction II
(c) Reaction IV
(d) Reaction V
Can you answer this question?

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Answer: Reaction IV
For, reaction to be spontaneous at all temperatures $\Delta S$ should be +ve and $\Delta H$ should be -ve (both the factors must favour the process).
Thus, only reaction (IV) will be spontaneous at all temperatures.
answered Feb 26, 2014 by mosymeow_1

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