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| | For a reversible reaction, aA +
bB cC + dD the product of the concentrations of the products (species on the
right), each raised to the power that corresponds to its coefficient in the
balanced chemical equation, divided by the product of the concentrations of
reactants (species on the left), each raised to the power that corresponds to
its coefficient in the balanced chemical equation. At equilibrium the mass
action expression is equal to K; at other times it is Q.[C]c[D]d [A]a[B]b = Q,
or at equilibrium K.
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