Q. The values of ΔH and ΔS for the reaction, C(graphite) + CO₂(g) → 2CO(g) are 170 kJ and 170 J K⁻¹, respectively. This reaction will be spontaneous at:
A) 910 K
B) 1110 K
C) 510 K
D) 710 K
Explanation
[Solution from source] ΔG = ΔH − TΔS becomes negative when T > ΔH/ΔS = 170000 J/170 J K⁻¹ = 1000 K. Only 1110 K is above 1000 K. Remember to convert kJ to J before dividing. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.