For Equilibrium between Al and Al2O3 at 1273oC, a) Determine the standard enthalpy, entropy and Gibbs free energy of formation of Al2O3 at 298K from Ellingham diagram. Compare the results in 1.a. b) Read the equilibrium oxygen pressure pO2(g), pH2(g) / pH2O(g) ratio, and pCO(g)/pCO2(g) ratio from the Ellingham diagram using correct scales! c) Write chemical reactions for Al(l) used for these three different scales. d) What must be the gas mixture for all to protect Al(l) from oxidation? Use equilibrium constants