## Chemistry 10th Edition

a. $K_c = \frac{[ H_{2}O ]^{ 2 }[ O_{2} ]^{ }}{[ H_{2}O_{2} ]^{ 2 }}$ b. $K_c = \frac{[ SO_{2} ]^{ 2 }}{[ O_{2} ]^{ 3 }}$ c. $K_c = \frac{1}{[ NH_{3} ][ HCl ]}$ d. $K_c = \frac{[ NO_{2} ]^{ 2 }}{[ N_{2}O_{4} ]}$ e. $K_c = \frac{[ HCl ]^{ 4 }[ O_{2} ]^{ }}{[ Cl_{2} ]^{ 2 }[ H_{2}O ]^{ 2 }}$
Write the equilibrium constant expression: - The exponent of each concentration is equal to its balance coefficient. - Pure solids and liquids do not appear in the equation. a. $K_c = \frac{[Products]}{[Reactants]} = \frac{[ H_{2}O ]^{ 2 }[ O_{2} ]^{ }}{[ H_{2}O_{2} ]^{ 2 }}$ b. $K_c = \frac{[Products]}{[Reactants]} = \frac{[ SO_{2} ]^{ 2 }}{[ O_{2} ]^{ 3 }}$ c. $K_c = \frac{[Products]}{[Reactants]} = \frac{1}{[ NH_{3} ][ HCl ]}$ d. $K_c = \frac{[Products]}{[Reactants]} = \frac{[ NO_{2} ]^{ 2 }}{[ N_{2}O_{4} ]}$ e. $K_c = \frac{[Products]}{[Reactants]} = \frac{[ HCl ]^{ 4 }[ O_{2} ]^{ }}{[ Cl_{2} ]^{ 2 }[ H_{2}O ]^{ 2 }}$