Question

Consider the following reaction:

Answer 1

Answer:

1.2 M

Explanation:

Let's consider the following reversible reaction.

CuS(s) + O₂(g) ⇌ Cu(s) + SO₂(g)

To find the equilibrium concentration of O₂ we will use an ICE Chart. We will only consider gases and aqueous species since the activity of solids and liquids is 1.

    CuS(s) + O₂(g) ⇌ Cu(s) + SO₂(g)

I                    2.9                      0

C                    -x                      +x

E                  2.9-x                     x

The equilibrium constant (Kc) is:

$Kc=1.5=\frac{[SO_{2}]}{[O_{2}]} =\frac{x}{2.9-x} \\x=1.7$

The concentration of O₂ at equilibrium is:

[O₂] = 2.9 -x = 2.9 - 1.7 = 1.2 M