Which statement describes a reaction at equilibrium?

January 2020 NY Regents Chemistry Exam

15 Which statement describes a reaction at equilibrium?

(1) The mass of the products must equal the mass of the reactants.

(2) The entropy of the reactants must equal the entropy of the products.

(3) The rate of formation of the products must equal the rate of formation of the reactants.

(4) The number of moles of the reactants must equal the number of moles of the products.

Solution: At equilibrium the rates of the forward and reverse reactions are equal and the concentration of reactants and products remains constant.

Answer: 3

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