Answer
$$K_P = 6.3 \times 10^{-13}$$
Work Step by Step
- The exponent of each pressure is equal to its balance coefficient.
$$K_P = \frac{P_{Products}}{P_{Reactants}} = \frac{P_{ NO } ^{ 2 }P_{ O_2 }}{P_{ NO_2 } ^{ 2 }}$$
2. Substitute the values and calculate the constant value:
$$K_P = \frac{( 6.5 \times 10^{-5} )^{ 2 }( 4.5 \times 10^{-5} )}{( 0.55 )^{ 2 }} = 6.3 \times 10^{-13}$$