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← JEE Main 2022 · 28 Jul · Shift 2
ChemistryInteger+4 / -1Question 55 of 90

JEE Main 2022 · 28 Jul · Shift 2, Chemistry question 55

At 600K, 2 mol of NO are mixed with 1 mol of O2\mathrm{O_2}.

2NO(g)+O2(g)⇌2NO2(g)\mathrm{2NO(g)+O_2(g)\rightleftharpoons2NO_2(g)}

The reaction occurring as above comes to equilibrium under a total pressure of 1 atm. Analysis of the system shows that 0.6 mol of oxygen are present at equilibrium. The equilibrium constant for the reaction is ______. (Nearest integer)

Answer and worked solution

Official answer: 2

Equilibrium amounts. O2\mathrm{O_2} 0.6, NO 1.2, NO2\mathrm{NO_2} 0.8 mol; total 2.6 mol at 1 atm.

KpK_p =(0.8/2.6)2(1.2/2.6)2(0.6/2.6)≈1.9=\frac{(0.8/2.6)^2}{(1.2/2.6)^2(0.6/2.6)}\approx1.9.

Answer: 2

Topics:Law of mass action and Kc, Kp
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