Question

A mixture of 1.00 mol SO2(g), 2.00 mol O2(g) and 1.00 mol SO3(g) is placed in a 1.00 dm3 container and allowed to reach equilibrium.

2SO2(g) + O2(g) 2SO3(g)

Distinguish between the terms reaction quotient, Q, and equilibrium constant, Kc.

Answer 1

K_c = [SO₃]²/[SO₂]²*[O₂] = 1²/1²*2 = 0.5

Q has the same equation as the equilibrium constant expression. But Q can be calculated for any conditions.