I don't know what kc is here, does anyone know how to go about this??

1) When 14.250 moles of PCl5 gas is placed in a 3.00 liter container and comes to equilibrium at a constant temperature, 40.0% of the PCl5 decomposes according to the equation:

PCl5(g) = PCl3(g) + Cl2(g).

What is the value of Kc for this reaction?

2) Given that the standard enthalpy of formation for NO(g) is 90.25 kJ/Mole, calculate the free energy change for the following reaction at 25oC.

N2(g) + O2(g) = 2 NO(g)

The absolute entropies of N2 is 192, NO is 211, and O2 is 205...

3) BaCO3(s) + HCl(aq) (What is the net ionic equation??)

Any help would be appreciated...thanks!