What quantities of reactants and products are present at equilibrium?
Equilibrium refers to equality of forward and reverse reaction rates, not of quantities of reactants and products. In the above chemical equilibrium, 78% of the mixture is in the form of HI(g), so appreciable quantities of both reactants and products are present. Some reactions establish equilibrium after the formation of only minute amounts of products. In others, only minute amounts of reactants remain at equilibrium. The composition of the equilibrium mixture is sometimes referred to in terms of equilibrium position.
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