The gas-phase reaction 4 NH _3(g)+5 O _2(g) 4 NO (g)+6 H _2 O (g) reaches equilibrium…

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

Problem

The gas-phase reaction

4\text{NH}_3(g)+5\text{O}_2(g)\rightleftharpoons4\text{NO}(g)+6\text{H}_2\text{O}(g)

reaches equilibrium in a closed container. Which expression correctly represents

K_p

for this reaction? (a)

K_p=\dfrac{(P_{\text{NH}_3})^4(P_{\text{O}_2})^5}{(P_{\text{NO}})^4(P_{\text{H}_2\text{O}})^6}

(b)

K_p=\dfrac{(P_{\text{NO}})^4(P_{\text{H}_2\text{O}})^6}{(P_{\text{NH}_3})^4(P_{\text{O}_2})^5}

(c)

K_p=\dfrac{(P_{\text{NO}})^4(P_{\text{H}_2\text{O}})^6}{(P_{\text{NH}_3})^4}

(d)

K_p=\dfrac{P_{\text{NO}}P_{\text{H}_2\text{O}}}{P_{\text{NH}_3}P_{\text{O}_2}}