AIPMT MAINS2010Chemistry-Thermodynamics
AIPMT MAINS 2010 Chemistry Gibbs Free Energy MCQ Question
Type: MCQ-numerical-Medium-Class 11
For vaporization of water at 1 atmospheric pressure, the values of ΔH and ΔS are 40.63 kJ mol⁻¹ and 108.8 J K⁻¹ mol⁻¹, respectively. The temperature when Gibbs energy change (ΔG) for this transformation will be zero, is
A
273.4 K
B
393.4 K
C
373.4 K
D
293.4 K
Correct Answer
Option C
Detailed Explanation
ΔG = ΔH - TΔS. Setting ΔG to zero gives T = ΔH/ΔS = 40.63 × 10³ J / 108.8 J K⁻¹ = 373.4 K.
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