General Chemistry: Principles and Modern Applications (10th Edition)

Published by Pearson Prentice Hal
ISBN 10: 0132064529
ISBN 13: 978-0-13206-452-1

Chapter 15 - Priciples of Chemical Equilibrium - Exercises - Writing Equilibrium Contants Expressions - Page 688: 3


(a) $$K_c = \frac{[NO_2]^2}{[NO]^2[O_2]}$$ (b) $$K_c = \frac{[Zn^{2+}]}{[Ag^+]^2}$$ (c) $$K_c = \frac{[OH^-]^2}{[C{O_3}^{2-}]}$$

Work Step by Step

1. The $K_c$ expression follows this pattern: $aA + bB \leftrightharpoons cC + dD$ $$K_c =\frac{[Products]}{[Reactants]} = \frac{[C]^c[D]^d}{[A]^a[B]^b}$$ Where solids and pure liquids do not appear on the expression. (a) $$K_c = \frac{[NO_2]^2}{[NO]^2[O_2]}$$ (b) $$K_c = \frac{[Zn^{2+}]}{[Ag^+]^2}$$ (c) $$K_c = \frac{[OH^-]^2}{[C{O_3}^{2-}]}$$
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