Question

Consider the following reaction:CuS(s) + O2(g) ↔ Cu(s) + SO2(g)A reaction mixture initially contains 2.9 M O2. Determine the equilibrium concentration of O2 if Kc for the reaction at this temperature is 1.5.

Answer 1

This reaction contains pure solids which are not considered when writing out equilibrium constant expressions.

O2...........SO2

I 2.9...........0

C -x.......... +x

E 2.9-x........ x

Q=0/2.9 = 0 ---->Q<K Reaction will go to the right

Since the coefficients are all 1, I won't bother putting in the exponents.

k=B/A

1.5= x / (2.9-x)

4.35 - 1.5x = x

2.5x = 4.35

x= 1.74

plug back in ice chart

2.9 - 1.74

=1.16

=1.2 ANSWER