For the equilibrium A₂(g) 2A(g), if a sample of A₂(g) is placed in a sealed container and allowed to come to equilibrium, which graph best represents the relationship between K_c and time as equilibrium is established?

Question

Quizplus · Accepted Answer

The given equilibrium is a gas phase reaction. In order to establish the equilibrium, the forward and backward reactions must proceed at equal rates. Initially, there will be only A₂(g) present, and as the reaction proceeds, it will be converted into 2A(g) and vice versa. As time passes, the concentration of A₂(g) will decrease, while the concentration of 2A(g) will increase. Therefore, the value of K_c will also change with time. At the beginning of the reaction, there will be no 2A(g) present, so K_c will be zero. As the reaction proceeds, the concentration of 2A(g) will increase, causing K_c to increase as well. At equilibrium, the concentrations will remain constant, and K_c will reach a constant value. Therefore, the graph that best represents the relationship between K_c and time as equilibrium is established is a graph where K_c starts at zero and gradually reaches a constant value. Option B shows this behavior, whereas the other options are incorrect because they either do not show a gradual increase in K_c or show a decrease in K_c at equilibrium.

For the Equilibrium A2(g) 2A(g), If a Sample of A2(g)

For the Equilibrium A₂(g) 2A(g), If a Sample of A₂(g)