Question
For a certain reaction, H^0 is -345 kJ and S^0 is -123\ JK ^ -1 . At what temperature the change over from spontaneous to nonspontaneous will occur?
MHT CET
Chemistry
Thermodynamics (C)
2026
MHT CET 2026 (15 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 1052 K
- B. 1956 K
- C. 2568 K
- D. 2805 K
Answer
D. 2805 K
Step-by-step solution
The changeover from spontaneous to nonspontaneous occurs when G^0 = 0. Using the Gibbs free energy equation: G^0 = H^0 - T S^0 Setting G^0 = 0 gives: T = H^0 S^0 Substituting the given values (converting H^0 to Joules): T = -345 10^3 J -123 JK ^ -1 T = 2804.87 K T 2805 K Answer: 2805 K
Related: Chemistry — Thermodynamics (C) · All PYQ Banks