Chemistry

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}

0.045\,\text{atm}

0.020\,\text{atm}

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