The reaction 12 , N _2(g)+ 32 , H _2(g) ; ; NH _3(g) is allowed to reach equilibrium…

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

Problem

The reaction

\tfrac12\,\text{N}_2(g)+\tfrac32\,\text{H}_2(g)\;\rightleftharpoons\;\text{NH}_3(g)

is allowed to reach equilibrium at 700\,K. The measured equilibrium partial pressures are

P_{\text{N}_2}=0.60\,\text{atm}

P_{\text{H}_2}=120\,\text{kPa}

, and

P_{\text{NH}_3}=25\,\text{kPa}

. What is the numerical value of

K_p

at 700\,K? (a)

2.5\times10^{-1}

(b)

2.4\times10^{-3}

(c)

2.5\times10^{-2}

(d)

3.1\times10^{-4}