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What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy driven? |
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Answer» The free energy change of a reaction is given by `DeltaG = DeltaH -TDeltaS` For a reaction to be spontaneous , `DeltaG` shouldbe `-ve`. If both `DeltaH`and `DeltaS` are positive, `DeltaG` can be `-ve` if `T Delta S gt DeltaH`in magnitudee. Thus, entropy factor should dominate over enthalpy factor. Such reactions are therefore, called entropy driven.This can happen in either of the following two ways `:` (i) `DeltaS` shoul beso learge that even if T is low , `T DeltaS` should be greater than`DeltaH` (ii) If` DeltaS`is small, T should be so large that`T DeltaS gt DeltaH` |
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