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

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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