For the reaction 2 SO _2(g)+ O _2(g) 2 SO _3(g) H^ =-197
CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
For the reaction 2SO2(g)+O2(g)⇌2SO3(g)ΔH∘=−197kJ
three separate stresses are applied to identical equilibrium mixtures.
I. The temperature is decreased by 30K.
II. An additional 0.50atm of O2(g) is injected at constant volume.
III. The volume of the container is reduced to one-half its original value at constant temperature.
Which of the following orders, from greatest to least increase in the equilibrium partial pressure of SO3(g), is most consistent with Le Châtelier’s principle?
(a) II > III > I
(b) III > I > II
(c) I > III > II
(d) I > II > III