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CGP EDU Academic Team
Published on: August 14, 2026
With the following informations, determine standard Gibb’s free energy of formation of N 2 O 4 (g). 
N 2 (g) + 
O 2 (g) ⎯→ NO(g) Δ Gº = 86.6 kJ .....(i)
NO(g) + 
O 2 (g) ⎯→ NO 2 (g) Δ Gº = –34.82 kJ.....(ii)
2NO 2 (g) ⎯→ N 2 O 4 (g) Δ Gº = –5.77 kJ .....(iii)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(97.79 kJ)
Multiplying both Eqs (i) and (ii) by 2 and finally adding them yields
N 2 (g) + 2O 2 (g) ⎯→ 2NO 2 (g) Δ Gº = 103.56 kJ
2NO 2 (g) ⎯→ N 2 O 4 (g) Δ Gº = –5.77 kJ ....(iii)
Adding N 2 (g) + 2O 2 (g) ⎯→ N 2 O 4 (g) Δ Gº = 97.79 kJ
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