Chem 30 - The Constant Equilibrium

Question

Once you have balanced the following chemical equation, choose the correct corresponding equilibrium law expression:

Ag₂CO_3(s)  ↔ Ag_(s)  + CO_2(g)  + O_2(g) 

Kc=?

Answer 1

I completely agree with @Stanton D., but I'm going to do one and hopefully you'll have an idea of what to do for the others. The equilibrium expression is written at the products divided by the reactants, each raised to a power equal to the coefficient in the balanced equation. Solids and liquids are not included. Thus, for the current problem we have ...

Ag₂CO_3(s)  ↔ Ag_(s)  + CO_2(g)  + O_2(g) 

Since Ag₂CO₃ and Ag are both solids, they will not appear in the equilibrium expression. That leaves CO₂(g) and O₂(g), and they are both products. So, as mentioned above, the equilibrium expression in the products over the reactants. This would be Kc = [CO₂][O₂] where [ ] indicates concentration.

If you happen to have something like A + 2B ==> C + 2D and none are solids or liquid, the equilibrium expression would be

Kc = [C][D]² / [A][B]²

Answer 2

Hi Jinjuu M.,

That's six questions, all on the same material area, all asked at the same time. One would have been sufficient to get the technique explained; six is misusing Wyzant to do your assignment.

-- Cheers, --Mr. d.