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Consider the following equilibrium: 2SO2(g) + O2(g) 2SO3(g) Which of the following is a correct equilibrium expression? Keq=[SO3][SO2][O2] Keq=[SO3]2[SO2]2[O2] Keq=[SO2][O2][SO3] Keq=[SO2]2[O2][SO3]2

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PBCHEM
Answer : Option B) [tex] K_{eq} = \frac{[SO_{3}]^{2} }{[SO_{3}]^{2} . [O_{3}]^{2}} [/tex]

Explanation : The equilibrium constant is often expressed in terms of the molar concentration of products divided by the product of molar concentrations of reactants.

So, [tex] K_{eq} = \frac{[products]}{[reactants]} [/tex].

Now, here in the given reaction of  

[tex]2SO_{2} + O_{2} ----\ \textgreater \ 2SO_{3}[/tex]

So, we have the equation for equilibrium as [tex] K_{eq} = \frac{[SO_{3}]^{2} }{[SO_{3}]^{2} . [O_{3}]^{2}} [/tex]

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