The Equilibrium Constant for a given reaction is measured at aseries of temperat

Question

The Equilibrium Constant for a given reaction is measured at aseries of temperatures and is found to increase with temperature.Assume the Delta H and Delta S are temperature-independent over therange of temperatures investigated.
1) what, if anything, can you conclude about the sign of DeltaH from the behavior? Briefly Explain.
2) what, if anything, can you conclude about the sign ofDelta S from the behavior? Briefly Explain.
1) what, if anything, can you conclude about the sign of DeltaH from the behavior? Briefly Explain.
2) what, if anything, can you conclude about the sign ofDelta S from the behavior? Briefly Explain.

Explanation / Answer

delG = -RT*lnK = delH - T*delS K = exp[ - delH/RT + delS/R] It T increases, the only way K increases is if delH is positive delS does not have a temperature term in the expression for K But from delG < 0 when spontaneous. This requires thatdelS is also positive, because than delH - T*delS is negative atsufficiently high T (from the previous part, you found that delH ispositive)

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