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at equilibrium, are the concentrations of the reactants and products the same?

at equilibrium, are the concentrations of the reactants and products the same?

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Answer #1

Solution.

At chemical equilibrium the concentrations of the reactants and products are NOT the same.

At chemical equilibrium the reaction rates of a direct and reverce reaction are the same.

For example, in reaction 2H2+O2=2H2O

the rate of a direct reaction is

ratedirect = kdirect[H2]2 [O2];

ratereverce = kreverce[H2O]2 ;

At chemical equilibrium ratedirect = ratereverce

kdirect[H2]2 [O2] = kreverce[H2O]2 ;

kdirect/kreverce = [H2O]2/([H2]2 [O2]) = Keq (equilibrium constant)

It means that the concentrations of the products and the reactants at chemical equilibrium remains unchanged.

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