Classify the following phase changes by the signs of the system\’s ΔH and ΔS.?

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Classify the following phase changes by the signs of the system

Question: Classify the following phase changes by the signs of the system\’s ΔH and ΔS.?

Option:

1) ΔH=+ ΔS=+

2) ΔH=+ ΔS=-

3)ΔH=- ΔS=+

4)ΔH=- ΔS=-

Answer:

  • liquid to gas 1
  • solid to gas 1
  • liquid to solid 4
  • gas to liquid 4
  • solid to liquid 1
  • gas to solid 4