An equimolar mixture of X (g) and Y (g) is placed inside a rigid container at constant temperature. The particle diagram above represents the changes that occur over time. Based on the particle
diagram, which of the following best predicts whether or not the system has reached equilibrium by 300 s?
a. It is not possible to determine that the system has reached equilibrium by 300 s because the stoichiometry of the reaction is not known.

b. it is not possible to determine that the system has reached equilibrium by 300 s because the amounts of X, Y, and XY have continued to change

c. The system has reached equilibrium by 300 s because the rate of formation of XY is constant
d. The system has reached equilibrium by 300 s because the rates of consumption of X and Y are equal

The system has been predicted to be not possible to reach equilibrium as changing X and Y concentration. Thus, option B is correct.

Equilibrium has been described as the condition in the reaction mixture, when the concentration of the product and the reactant are equal.

The given reaction has been represented as:

[tex]\rm X+Y\rightarrow\;XY[/tex]

Reaction mixture at 300 s

The given reaction has been represented as, with the increase in time, there has been the consumption of the reactant and the formation of product.

The concentration has been continuously changing with time. Thus, the determination of the equilibrium has been difficult with changing X and Y concentration.

Thus, option B is correct.

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