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Consider the reaction:

$$2NO(g) + O_2(g) ⇄ 2NO_2(g)$$

A reaction mixture at 500. K initially contains 760 torr of $NO$ and 1520 torr of oxygen gas.

At equilibrium, the total pressure of the reaction mixture is 2090 torr.

Which of the following is $K_p$ at 500. K?

A

$$ \cfrac{5}{64} $$

B

$$ \cfrac{19}{64} $$

C

$$ \cfrac{1}{1.75} $$

D

$$ \cfrac{9}{2} $$

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