Consider the air pollutants NO and NO2, contributors to photochemical smog. Both
ID: 613916 • Letter: C
Question
Consider the air pollutants NO and NO2, contributors to photochemical smog. Both can be formed by the reation between atmospheric nitrogen and oxygen. At 25 C,
N2(g)+O2(g)----2NO(g)K1=4.2E-31 (1)
N2(g)+2O2(g)----2NO2(g) K2=1.0E-18(2)
A) Wtire the equilibrium constant expression for the formation of two moles of NO at 25 C
B) CalculateK for the formation of one mole of NO at 25 C
C) Caluculate K for the decomposition of one mole of NO2 at 25 C
D) Calculate K for the following reaction at 25 C
2NO(g)+O2(g)----2NO2(g)
Explanation / Answer
A) K = [NO]^2/[N2][O2] B) for one mole NO K = sqrt(K1) = sqrt(4.2E-31) = 6.48 E-16 C) for one mole NO2 K = sqrt( 1/K2) = sqrt(1/E-18) = 1E9 D) K = (k2/K1) = 2.38 E-12