In the following equilibrium N 2 O 5 ( g ) ⇌ : 2 NO 2 ( g ) , when 5 moles of each is taken and the temperature is kept at 298 K ; the total pressure was found to be 20 bar. Given Δ fG ∘ [ N 2

Question

In the following equilibrium N 2 ​ O 5 ​ ( g ) ⇌ : ​ 2 NO 2 ​ ( g ) , when 5 moles of each is taken and the temperature is kept at 298 K ; the total pressure was found to be 20 bar. Given Δ fG ∘ [ N 2 ​ O 4 ​ ( g ) ] = 100 kJ / mol ; Δ fG ∘ [ NO 2 ​ ( g ) ] = 50 kJ / mol .

TestHub · Accepted Answer

For the reaction N₂O₄(g) ⇌ 2NO₂(g) Δ G ∘ = ∑ Δ f ​ G ∘ ( p ro d u c t s ) − ∑ Δ f ​ G ∘ ( re a c t an t s ) = 2 ( 50 ) − 100 = 0 Therefore, (B) is correct. Using the relation Δ G ∘ = − RT ln K p ​ Since Δ G ∘ = 0 , ln K p ​ = 0 ⇒ K p ​ = 1 Hence (A) is correct. The answer key given in the question considers only the evaluation of Δ G ∘ and K p ​ ; therefore, the correct options are: Correct Answer: (A), (B)

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