Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The following reaction is performed at 298 K.
2NO(g) + O 2 (g) 
2NO 2 (g)
The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO 2 (g) at 298 K? (K P = 1.6 × 10 12 )
A
R(298) in (1.6 × 10 12 ) – 86600
B
86600 + R(298) ln (1.6 x 10 12 )
C
86600 – 
D
0.5 [2 × 86,600 – R (298) ln (1.6 × 10 12 )]
Text Solution
Verified by ExpertsThe correct answer is:
D
2 Δ Gº f (NO2) – [2 Δ Gº f (NO) + Δ Gº f (O2) ] = Δ Gº r = – RT λ n K p
2 Δ Gº f (NO2) – [2 × 86,600 + 0] = – RT λ n K p Δ Gº f (NO2) = 0.5[2 × 86,600 – R (298) λ n(1.6 × 10
12 )]
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