Chemistry expression for the equilibrium constant?

[frycat]

1. Write the expression for the equilibrium constant, Kc, for the following chemical reaction.
Sn2+(aq) + O2(g) + 3H2O(l) SnO2(s) + 2H3O+(aq)

2. Write the expression for the equilibrium constant, Kc, for the following chemical reaction equation.
2C6H6(g) + 15O2(g) 12CO2(g) + 6H2O(g)