For the homogeneous gas-phase reaction X_2(g) 2X(g) the equilibrium constant at 800 K is

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

Problem

For the homogeneous gas-phase reaction

\mathrm{X_2(g)\rightleftharpoons 2X(g)}

the equilibrium constant at 800 K is

K_p=5.0\times10^{-4}

. If an equilibrium mixture at this temperature contains

p_{\mathrm{X_2}}=1.0\,\text{atm}

, which of the following is the best estimate of

p_{\mathrm{X}}

in the mixture? (a)

0.002\,\text{atm}

(b)

0.045\,\text{atm}

(c)

0.020\,\text{atm}

(d)

5.0\times10^{-4}\,\text{atm}