Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 15 - Questions and Problems - Page 708: 15.19

Answer

(a) $$K_c = \frac{[NH_3]^2}{[NO_2]^2[H_2]^7}$$ $$K_p = \frac{P_{NH_3}^2}{P_{NO_2}^2P_{H_2}^7}$$ (b) $$K_c = \frac{[SO_2]^2}{[O_2]^3}$$ $$K_p = \frac{P_{SO_2}^2}{P_{O_2}^3}$$ (c) $$K_c = \frac{[CO]^2}{[CO_2]}$$ $$K_p = \frac{P_{CO}^2}{P_{CO_2}}$$ (d) $$K_c = \frac{[C_6H_5COO^-][H^+]}{[C_6H_5COOH]}$$

Work Step by Step

The $K_p$ expression follows this pattern: $$K_p = \frac{P_{products}}{P_{reactants}}$$ Where the exponent of each partial pressure is equal to the balance coefficient of the compound. The $K_c$ expression is very similar, but it uses the concentration of the compounds, and every compound that is not in the form of a pure solid or a pure liquid appear on the expression. If there is not any compound in the gaseous form, the $K_p$ is not applicable.
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