2.00 moles of methane and 1.00 moles of steam are allowed to reach equilibrium in a 1.00dm³ container. At equilibrium 0.66 mol steam remains.
Calculate a value for the equilibrium constant and give its units.
CH4 (g)+ H2O (g)⇌ 3H2(g) + CO(g) ∆rH = +206kJ mol-1
I know how to calculate KC once I have the moles and the mark scheme just does not help at all with calculating the moles of each substance.