Problem: Predict how the entropy of the substance is affected in the following processes: a) O2(g, 200 kPa, 300 K) → O2(g, 100 kPa, 300 K)b) I2(g, 1 bar, 125°C) → I2(g, 1 bar, 200°C)c) Fe(s, 1 bar, 250°C) → Fe(s, 1 bar, 25°C)

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a) O2(g, 200 kPa, 300 K)  O2(g, 100 kPa, 300 K):

  • 200 kPa → 100 kPa = ↓ P
  • ↓ P = ↑ ΔS
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Problem Details

Predict how the entropy of the substance is affected in the following processes: 

a) O2(g, 200 kPa, 300 K) → O2(g, 100 kPa, 300 K)

b) I2(g, 1 bar, 125°C) → I2(g, 1 bar, 200°C)

c) Fe(s, 1 bar, 250°C) → Fe(s, 1 bar, 25°C)

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