Kc = (PCl3)(Cl2)/(PCl5) = 4.2 x 10^-2
With Kc equal to less than 1, that means that the numerator is smaller than the denominator and that means the reactants will be larger than the products. A second reason, and you need to Kc value, all materials are gaseous and the side with the smaller number of moles is the preferred side if pressure rises.
The value of the equilibrium constant, Kc, at a certain temperature is 4.20 x 10-2. Would the reaction as represented by the chemical equation favor reactants or products? Enter Product or Reactant.
PCl5(g) = PCl3(g)+Cl2(g)
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