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SAT® Subject Test in Chemistry

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Moderate

Equilibrium Expression HI Formation

SATCHM-3VKVDX

What is the $K_{eq}$ for the following reaction?

$$H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$$

A

$ \cfrac { [H_{ 2}][I_{ 2}] }{ 2[HI] } $

B

$ \cfrac { [HI]^{ 2 } }{ [H_{ 2 }][I_{ 2 }] } $

C

$ \cfrac { [H_{ 2 }][I_{ 2 }] }{[HI]^{ 2 } } $

D

$ \cfrac { 2[HI] }{ [H_{ 2 }][I_{ 2 }] } $

E

$ \cfrac { [H_{ 2 }]+[I_{ 2 }] }{ [HI]^{ 2 } } $