3.7 Entropy and feasibility of reactions

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8 Terms

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Entropy

‘The dispersal of energy’

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The more disordered the greater the entropy so…

A gas has more entropy than a liquid which will have more entropy that a solid

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The standard entropy, Sө of a substance

The entropy content of one mole of the substance under standard conditions. Standard entropies have the units J K-1 mol-1

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Standard entropy change of reaction

The entropy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, where all reactants and products are in their standard states.

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How tgo work out standard entropy change

entropy of products - entropy of reactants

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(Gibbs) Free Energy, G.

ΔG = ΔH – TΔS

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If ΔG is negative then…

a reaction is feasible and should go ahead.

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If ΔG is positive then…

at that particular temperature the reaction is not feasible.