The entropy change, equations
The entropy change for a chemical system is the is the difference between the entropies of the reactants and products in the equation for the reaction:
ΔS(system) = ∑ΔS (products) - ∑ΔS (reactants)
The entropy change for the surroundings depends on the transfer of heat to/from the surroundings.
ΔS(surroundings) = ΔH / T
ΔS (total) = ΔS(surroundings) + ΔS(system)
Knowing the total entropy change enables predictions to be made.
- if ΔS (total) is positive, a reaction will occur spontaneously
- if ΔS (total) is 0, the reaction is at equilibrium.
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