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Solution - Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties

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Question

Absolute entropies of solids, liquids and gases can be determined by

  • Measuring heat capacity of substance at various temperatures
  • Subtracting standard entropy of reactants from products
  • Measuring vibrational motion of molecules
  • Using formula ΔS° = ST° - SO°

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Determine whether the reactions with the following ΔH and ΔS values are spontaneous or non-spontaneous. State whether the reactions are exothermic or endothermic.

(a) ΔH = -110kJ, ΔS = + 40JK-1 at 400 K

(b) ΔH = + 40kJ, ΔS = -120JK-1 at 250K

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Solution for concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties. For the courses 12th HSC Science (Computer Science), 12th HSC Science (Electronics), 12th HSC Science (General)
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