At a certain point in time, a 1.00 L rigid reaction vessel contains 1.5 mol of PClX3(g), 1.0 mol of
ClX2(g), and 2.5 mol of PClX5(g). Which of the following describes how the measured pressure in the reaction
vessel in the reaction vessel will change and why it will change that way as the reaction system approaches equilibrium at constant temperature?
Since Q is less than Kc, the equilibrium position will shift to the products. The pressure will decrease since two molecules of gas will turn into only 1 molecule of gas, resulting in a net decrease in gas pressure.