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# Equilibrium Constant

APCHEM-QXGS2V

If, at a given temperature, the equilibrium constant for the reaction:

$$H_{2(g)} + Cl_{2(g)} \rightleftarrows 2HCl_{(g)}$$

...is $K_p$, then the equilibrium constant for the reaction:

$$HCl_{(g)} \rightleftarrows \cfrac{1}{2} H_{2(g)} + \cfrac{1}{2} Cl_{2(g)}$$

...can be represented as

A

$K=\cfrac { 1 }{ { (K_p) }^{ 2 } }$

B

$K=\cfrac { 1 }{ { (K_p) }^{ 1/2 } }$

C

$K = K_p^2$

D

$K = K_p^{1/2}$