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which of rxns are spontaneous at high temp and non spontaneous at low temperature.... wt i hv to do some rxns r given

which of rxns are spontaneous at high temp and non spontaneous at low temperature.... wt i hv to do some rxns r given

Grade:12

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
we have ΔG=ΔH-TΔS
When ΔS is positive and ΔH is negative, a process is always spontaneous

When ΔS is positive and ΔH is positive, a process is spontaneous at high temperatures, where exothermicity plays a small role in the balance.

When ΔS is negative and ΔH is negative, a process is spontaneous at low temperatures, where exothermicity is important.

When ΔS is negative and ΔH is positive, a process is not spontaneous at any temperature, but the reverse process is spontaneous.

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