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SAT® Subject Test in Chemistry

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Equilibrium Expression

SATCHM-EVSGNP

$$PCl_3(g) + Cl_2(g) \rightleftharpoons PCl_5(g) + \text{energy}$$

What is the equilibrium expression for the reaction shown above?

A

$ \cfrac { [PCl]^{ 5 }[PCl]^{ 3 } }{ [Cl]^{ 2 } } $

B

$ \cfrac { [PCl_{ 3}][PCl_{ 2}] }{ [PCl_{ 5}] } $

C

$ \cfrac { [PCl_{ 3 }][PCl_{ 2 }] }{ [PCl_{ 5 }][energy] } $

D

$ \cfrac { [PCl_{ 5 }] }{ [PCl_{ 3 }][Cl_{ 2 }] } $

E

$ \cfrac { [PCl]^{ 3 } [Cl]^{ 2 }}{ [PCl] ^{ 5 }} $