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At a certain temperature, 0.700 mol SO3 is placed in a 3.50 L container. 2SO3(g)↽−−⇀2SO2(g)+O2(g) At equilibrium, 0.180 mol O2 is present. Calculate c.

Sagot :

Answer: The value of [tex]K_c[/tex] for the given chemical equation is 0.0457.

Explanation:

Given values:

Initial moles of [tex]SO_3[/tex] = 0.700 moles

Volume of conatiner = 3.50 L

The given chemical equation follows:

            [tex]2SO_3(g)\rightleftharpoons 2SO_2(g)+O_2(g)[/tex]

I:             0.700

C:              -2x           +2x           x

E:           0.700-2x      2x            x

Equilibrium moles of [tex]O_2[/tex] = x = 0.180 moles

Equilibrium moles of [tex]SO_2[/tex] = 2x = [tex](2\times 0.180)=0.360moles[/tex]

Equilibrium moles of [tex]SO_3[/tex] = 0.700 - 2x = [tex]0.700-(2\times 0.180)=0.340moles[/tex]

Molarity is calculated by using the equation:

[tex]Molarity=\frac{Moles}{Volume}[/tex]

So,

[tex][SO_3]_{eq}=\frac{0.340}{3.50}=0.0971M[/tex]

[tex][SO_2]_{eq}=\frac{0.360}{3.50}=0.103M[/tex]

[tex][O_2]_{eq}=\frac{0.180}{3.50}=0.0514M[/tex]

The expression of [tex]K_c[/tex] for above equation follows:

[tex]K_c=\frac{[SO_2]^2[O_2]}{[SO_3]^2}[/tex]

Plugging values in above expression:

[tex]K_c=\frac{(0.0971)^2\times 0.0514}{(0.103)^2}\\\\K_c=0.0457[/tex]

Hence, the value of [tex]K_c[/tex] for the given chemical equation is 0.0457.