The molar residual entropy (in J / K) for solid OCS is close to

Q44 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Physical Chemistry · Chapter: Gaseous State · Topic: Gaseous State – General · Marks: 2 · Difficulty: Easy

The molar residual entropy (in $\mathrm{J} / \mathrm{K}$ ) for solid OCS is close to

(a)0

(b)2.9

(c)5.8

(d)8.7

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

OCS is linear and can freeze in two orientations (OCS / SCO), so the residual entropy is R ln 2 = 8.314 × 0.693 = 5.76 J K⁻¹ mol⁻¹.

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