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Which statement is true for all equilibrium systems?
A. The mass of the reactants is equal to the mass of the products.
B. The addition of a catalyst changes the equilibrium concentrations.
C. The concentration of the reactants is equal to the concentration of the products.
D. Heating the system always favors the exothermic reaction.
E. The rate of the forward reaction is equal to the rate of the reverse reaction.

Respuesta :

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E. the rate of the forward reaction is equal to the rate of the reverse reaction
Dejanras

Answer is: E. The rate of the forward reaction is equal to the rate of the reverse reaction.

In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time.  

Reaction rates of the forward and backward reactions are equal and  there are no changes in the concentrations of the reactants and products.

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