How can I calculate the equilbrium constant and delta G and S given the enthalpy per mol of reaction and the final number of moles at equilbrium?

How can I calculate the equilbrium constant and delta G and S given the enthalpy per mol of reaction and the final number of moles at equilbrium?H2 + Br2 <--> 2HBr (all gaseous) and equal number of mols of H2 and Br2 originally used.