Consider the oxidation of silicon with water vapor at 800 C. a. Find the standard free...

 

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Consider the oxidation of silicon with water vapor at 800 °C. a. Find the standard free energy of formation of SiO₂ and H₂O. b. Combine them to compute AGrxn for the reaction Si + 2H₂O → SiO₂ + 2H₂ c. Evaluate the equilibrium constant and the (H₂/H₂O) ratio in equilibrium with silicon and its oxide at 800 °C. d. Compute the equilibrium partial pressure of oxygen in the silicon-silica system at 800 °C. e. Compute the equilibrium partial pressure of oxygen for a gas mixture at 800 °C with an (H₂/H₂O) ratio computed in part (c). f. Compare oxygen pressure values in parts (d) and (e). Consider the oxidation of silicon with water vapor at 800 °C. a. Find the standard free energy of formation of SiO₂ and H₂O. b. Combine them to compute AGrxn for the reaction Si + 2H₂O → SiO₂ + 2H₂ c. Evaluate the equilibrium constant and the (H₂/H₂O) ratio in equilibrium with silicon and its oxide at 800 °C. d. Compute the equilibrium partial pressure of oxygen in the silicon-silica system at 800 °C. e. Compute the equilibrium partial pressure of oxygen for a gas mixture at 800 °C with an (H₂/H₂O) ratio computed in part (c). f. Compare oxygen pressure values in parts (d) and (e).

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a From the standard free energy data tables standard free energy of formation of SiO and HO vapor ar... View the full answer