Entropy Key Points and Definitions

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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. In calculations concerning ΔG= ΔH - TΔS entropy is worked out using K

  • To convert C to K add 273 and the opposite to convert K to C
  • The entropy change that accompanies a reaction in the molar quantities as expressed in a chemical equation under standard conditions, all in standard states

3. In calculations concerning ΔG= ΔH - TΔS 1, units must be the same for kJ/J

  • The units need to be the same, to convert ΔS to kJ K^-1 mol^-1 /1000
  • TΔS

4. Entropy increases during the changes in state that give more randomness, for example

  • S is always a positive number
  • solid (low entropy --> gas (high entropy)
  • 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

Comments

Lizzie Keys

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

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