boiling points, respectively, of the oxides. 4) Using Ellingham diagram, answer following questions: a) Read the equilibrium partial pressure of PO2 for SiSiO2 and NiNiO at 1000C b) Determine the standard enthalpy and entropy of change at room temperature for SiSiO2 reaction. c) To protect Si and Ni from oxidation what must be the oxygen pressure in the test atmosphere? d) Assume you put large amount of Ni and Si in the closed furnace with limited air volume at 1000C. What does happen to Ni and si 2 after reaction with air? Which elerrent or s and oxide. or s do exist when reoctions finish? Explain with the values you get aboue