MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryThermodynamics and ThermochemistryPrevious Year Questions
If the enthalpy change for the transition of liquid water to steam is 30 kJ mol–1 at 27°C, the entropy change for the process would be (2011)
A.10 J mol–1 K–1
B.1.0 J mol–1 K–1
C.0.1 J mol–1 K–1
D.100 J mol–1 K–1✓ Correct
Explanation
We know that ∆G = ∆H – T∆S 0 = ∆H – T∆S [∵ ∆G = 0 as transition of H₂O(l) ⇌ H₂O(v) is at equilibrium] 3 1 1 H 30 10 S 100J mol K T 300 x
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