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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper I covers physical and inorganic chemistry.

Indian Forest Service (Mains), Chemistry optional · 2024 · Paper I

Q8(c). Entropy comparison of neon and argon

Question

Among Ne and Ar under similar conditions, whose standard molar entropy is larger? Explain. Assume both are perfect gases.

Answer in brief

Argon has the larger standard molar entropy at the same temperature and pressure because its greater mass gives more closely spaced translational energy levels.

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As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Topic notes: the second and third laws, entropy, Gibbs energy and Maxwell relations, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversSackur-Tetrode equationtranslational entropystandard molar entropyneon argon entropystatistical thermodynamics

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