The more disorder present the higher the entropy gas

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The more disorder present, the higher the entropy. Gas molecules move more freely than liquid molecules and are higher in entropy. Cyclic molecules have more restricted bond rotation than similar acyclic molecules and are lower in entropy. Δ S° is (+) when the products are more disordered than the reactants. Δ S° is (-) when the products are less disordered than the reactants. Reactions resulting in increased entropy are favored.
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7 Thermodynamics Enthalpy and Entropy Entropy changes are important when – the number of molecules of starting material differs from the number of molecules of product in the balanced chemical equation. an acyclic molecule is cyclized to a cyclic one, or a cyclic molecule is converted to an acyclic one. Thermodynamics Enthalpy and Entropy In most other reactions that are not carried out at high temperature, the entropy term (T Δ S°) is small compared to the enthalpy term ( Δ H°), and therefore it is usually neglected.
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8 Impact of Thermodynamics and Kinetics on Mechanism Thermodynamics: Stability of product vs. stability of substrates Δ G°= Δ H° - T Δ Kinetics: Stability of substrates vs. stability of TS Δ G = Δ H - T Δ S (transition state theory) Kinetics vs. Thermodynamics: • no simple functional dependence • depending on conditions, reactions can be carried out under thermodynamic or kinetic control
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