## Chemistry (7th Edition)

Published by Pearson

# Chapter 14 - Chemical Equilibrium - Section Problems - Page 594: 55

#### Answer

a. $$K_c = \frac{[ CH_3CHO ]^{ 2 }}{[ C_2H_4 ]^{ 2 }[ O_2 ]}$$ b. $$K_c = \frac{[ CO_2 ][ H_2 ]}{[ CO ][ H_2O ]}$$ c.$$K_c = \frac{[ NO ]^{ 4 }[ H_2O ]^{ 6 }}{[ NH_3 ]^{ 4 }[ O_2 ]^{ 5 }}$$

#### Work Step by Step

1. Write the equilibrium constant expression: - The exponent of each concentration is equal to its balance coefficient. a. $$K_c = \frac{[Products]}{[Reactants]} = \frac{[ CH_3CHO ]^{ 2 }}{[ C_2H_4 ]^{ 2 }[ O_2 ]}$$ b. $$K_c = \frac{[Products]}{[Reactants]} = \frac{[ CO_2 ][ H_2 ]}{[ CO ][ H_2O ]}$$ c.$$K_c = \frac{[Products]}{[Reactants]} = \frac{[ NO ]^{ 4 }[ H_2O ]^{ 6 }}{[ NH_3 ]^{ 4 }[ O_2 ]^{ 5 }}$$

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