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

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:

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


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