What is the equilibrium constant expression for each reactions?

Question

1.) C2H2 + 3 O2 ---> 2 CO2 + 2 H2O
2.) 4 HI ---> 2 H2 + 2 I2

Answer 1

Keq = (products)^x/(reactants)^y
where x and y are the coefficients.
This is pretty fundamental. I'll be glad to check your answers if you will post.