Standard molar entropy
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In chemistry, the standard molar entropy is the entropy content of one mole of substance, under conditions of standard temperature and pressure. By comparing the entropies S and enthalpies H of products and reactants in a chemical reaction, we can determine whether the reaction will go forward or backwards. If the Gibbs free energy (G = H - TS) is negative, the forward reaction will take place. The standard molar entropy is usually given the symbol S0, and the units J/(mol·K) (joules per mole-kelvin).
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