At 298 K the following equilibria involve only gaseous species

CHEMISTRY · Single correct · A Level · Chemistry · Gaseous equilibria (Kp) · Gaseous equilibria (Kp)

Problem

At 298 K the following equilibria involve only gaseous species. 1.

2\,\mathrm{NO_2}(g)\;\rightleftharpoons\;\mathrm{N_2O_4}(g)

K_{c1}=1.5

\mathrm{N_2O_4}(g)\;\rightleftharpoons\;\mathrm{N_2O_3}(g)+\dfrac{1}{2}\,\mathrm{O_2}(g)

K_{p2}=0.25

Using

R=0.0821\,\mathrm{L\,atm\,mol^{-1}\,K^{-1}}

, what is

K_p

for the overall reaction

2\,\mathrm{NO_2}(g)\;\rightleftharpoons\;\mathrm{N_2O_3}(g)+\dfrac{1}{2}\,\mathrm{O_2}(g)

at 298 K? (a)

3.8\times10^{-3}

(b)

1.5\times10^{-2}

(c)

3.8\times10^{-1}

(d)

6.1\times10^{-2}