Chemistry

Problem

Consider the gas-phase equilibrium

\mathrm{2SO_2(g)+O_2(g)\;\rightleftharpoons\;2SO_3(g)}\qquad (\Delta H<0)

initially at equilibrium at

700\,\mathrm{K}

and

1.0\,\mathrm{atm}

in a rigid container. Predict the ranking, from greatest to least, of the following independent actions in terms of the amount of

\mathrm{SO_3(g)}

present at the new equilibrium. A. Lower the temperature to

650\,\mathrm{K}

. B. Double the total pressure by halving the volume. C. Add

\mathrm{0.10\,atm}

\mathrm{SO_2(g)}

. D. Inject a catalyst. Provide your ranking; list equal effects together if appropriate.