Question

The atmospheric oxidation of NO

2NO_(g) + O_2(g) ⇌ 2NO_2(g)

was studied with initial pressure of 1 atm of NO and 1 atm of O₂. At equilibrium, partial pressure of oxygen is 0.52 atm. Calculate K_p of the reaction.

Answer 1

	NO	O2	NO2
Initial partial pressure	1	1	-
Reacted	2x	x	-
Equilibrium partial pressure	1 - 2x	1 - x = 0.52	2x

As, 1 – x = 0.52 

x = 0. 48  

= At equilibrium, 

P_NO = 1 – 2x = 1 – 2(0.48) = 0.04 

\(P_{NO_2}\) = 2x = 2(0.48) = 0.96