Entropy Key Points and Definitions

1. The standard entropy change of a reaction can be calculated using the standard entropies of the reactants and products:

  • ΔSºreaction = ΣSº(products) - ΣSº(reactants)
  • The entropy content of one mole of the substance under standard conditions
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2. If a change makes a system more random ΔH is positive, and if a change makes a system more ordered, ΔS is

  • Negative
  • ΔSºreaction = ΣSº(products) - ΣSº(reactants)

3. The standard entropy S, of a substance is

  • The entropy content of one mole of the substance under standard conditions
  • S is always a positive number

4. In a reaction where there is an increase in the number of gaseous molecules, entropy

  • Increases
  • ΔSºreaction = ΣSº(products) - ΣSº(reactants)
  • Decreases

5. For an endothermic reaction to take place spontaneously, ΔS must be positive, and the temperature must be high enough so that

  • TΔS>ΔH
  • TΔS
  • The balance between enthalpy, entropy, and temperature for a process: ΔG = ΔH - TΔS

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Lizzie Keys

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This is quite helpful but the answers are obvious when only one option makes sense. Hehe.

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