For the reaction

CHEMISTRY · Subjective · A Level · Chemistry · Gaseous equilibria (Kp) · Gaseous equilibria (Kp)

Problem

For the reaction

\mathrm{2\,SO_2(g)+O_2(g)\,\rightleftharpoons\,2\,SO_3(g)}

K_p=1.2

800\,\text{K}

and

\Delta H^{\circ}=-198\,\text{kJ\,mol}^{-1}

. A mixture at

800\,\text{K}

has

P_{\mathrm{SO_2}}=0.40\,\text{atm}

P_{\mathrm{O_2}}=0.20\,\text{atm}

, and

P_{\mathrm{SO_3}}=0.10\,\text{atm}

. The temperature is suddenly raised to

900\,\text{K}

. Using

R=8.314\,\text{J\,mol}^{-1}\,\text{K}^{-1}

, calculate

K_p

900\,\text{K}

and determine whether

\mathrm{SO_3}

will form or decompose as the system moves toward the new equilibrium.