Predicting relative So values of a system
1. Temperature changes
2. Physical states and phase changes
3. Dissolution of a solid or liquid
5. Atomic size or molecular complexity
4. Dissolution of a gas
So increases as temperature rises.
So increases as a more ordered phase changes to a less ordered phase.
So of a dissolved solid or liquid is usually greater than So of the pure solute. However, the extent depends on the nature of the solute and solvent.
A gas becomes more ordered when it dissolves in a liquid or solid.
In similar substances, increases in mass relate directly to entropy.
In allotropic substances, increases in complexity (e.g., bond flexibility) relate directly to entropy.
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