Chapter 10 - Reaction Rates and Chemical Equilibrium - 10.3 Equilibrium Constants - Questions and Problems - Page 383: 10.18

$$K_c = 6.1$$

1. Write the equilibrium constant expression: $$K_c = \frac{[Products]}{[Reactants]} = \frac{[ CO ][ H_2O ]}{[ CO_2 ][ H_2 ]}$$ 2. Substitute the values and calculate the constant value: $$K_c = \frac{( 0.20 )( 0.30 )}{( 0.30 )( 0.033 )} = 6.1$$