The equilibrium constant values of several reactions were measured at different temperatures. From the Kc values obtained below, chose the two reactions that favor the reactants.

Question

a) 0.875 b) 9.6 c) 1 d) 0.387 e) 56

Answer 1

Kc is the ratio of concentration of products to reactants, or Products divided by Reactants. ([Products] / [Reactants])

If the Kc is > 1 it favors the Products as it is on top of the fraction. It is saying you made a lot of Products during the reaction and you have less Reactants left.

if the Kc is <1 it favors the Reactants as it is on the bottom of the fraction (dividing by a large number gives you a small number.

Based on this you should be able to select the correct two choices.