Problem: 2CO2(g) ⇌ 2CO(g) + O2(g)      Kc = 2.0 x 10-7If 2.0 mol of CO2 is placed in a 5.0 Liter container, and decomposes according to the above equation, calculate the concentration of O2 at equilibrium.A. 2.0 x 10-3 MB. 4.6 x 10-3 MC. 9.2 x 10-3 MD. 2.7 x 10-3 ME. 5.8 x 10-3 M

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We are being asked to calculate the concentration of O2 at equilibrium:

2 CO2(g) ⇌ 2 CO(g) + O2(g)      Kc = 2.0 x 10-7


When dealing with equilibrium and Kc:

• Kc → equilibrium units are in molarity 
• Kc is an equilibrium expression:

Kc=productsreactants

▪ only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression

We're going to calculate for the final concentration of HI(g) using the following steps:

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Problem Details

2CO2(g) ⇌ 2CO(g) + O2(g)      Kc = 2.0 x 10-7

If 2.0 mol of CO2 is placed in a 5.0 Liter container, and decomposes according to the above equation, calculate the concentration of O2 at equilibrium.

A. 2.0 x 10-3 M

B. 4.6 x 10-3 M

C. 9.2 x 10-3 M

D. 2.7 x 10-3 M

E. 5.8 x 10-3 M

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