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Which statement describes this reaction at equilibrium?

NY Regents Chemistry Exam June 2022


21. Given the equation representing a system at equilibrium: 2NO2(g) ⇌ N2O4(g)

Which statement describes this reaction at equilibrium?

1. The concentration of the reactant and the product must be equal. 2. The concentration of the reactant and the product must be constant. 3. The rates of the forward and reverse reactions are increasing. 4. The rates of the forward and reverse reactions are decreasing.


Explanation: There are two facts that we need to memorize about a reaction at equilibrium. First, at equilibrium the rate of forward and reverse reactions are equal. Secondly, the concentration of reactants and products will remain constant.

Answer: 2

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