In order to write the correct mass-action expression for a reaction one must

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In order to write the correct mass-action expression, one must have a properly balanced chemical equation which shows the stoichiometry of the reaction. This provides the basis for determining the equilibrium constant and the concentrations of the reactants and products that are involved in the reaction. Knowing the kinetic rate law, mechanism, limiting reactant, and actual concentrations of reactants are important for determining the rate of the reaction, but they are not necessary for writing the mass-action expression.

In Order to Write the Correct Mass-Action Expression for a Reaction