A gaseous reactant A forms two different product, in parallel reaction, B and C as follows :
A ⎯→ B; Δ Hº = –3kJ, Δ Sº = 20JK –1 A ⎯→ C; Δ Hº = –3.6 kJ, Δ Sº = 10 JK
–1
Discuss the relative stability of B and C on the basis of Gibb’s free energy change at 27ºC.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
Δ Gº indicates that B is more stable than C.
A ⎯→ B Δ H° = – 3kJ Δ S° = 20 J/kJ
A ⎯→ C Δ H° = – 3.6 kJ Δ S° = 10 J/kJ
(i) For A ⎯→ B(A ⎯→ B Δ G = Δ H – T Δ S = – 3 – 
= – 9 kJ = – 9000 J
(ii) For A ⎯→ C (A ⎯→ C Δ G = – 3.6 – 
= – 6.6 kJ = – 6600 J
Δ Gº Indicate that B is more stable than C.
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