An important step in the manufacture of sulfuric acid is the gas-phase oxidation reaction

Compute the equilibrium conversion of sulfur dioxide to sulfur trioxide over the temperature range of 0 to 1400°C for a reactant mixture consisting of initially pure sulfur dioxide and a stoichiometric amount of air at a total pressure of 1.013 bar. (Air contains 21 mol % oxygen and 79 mol % nitrogen.)

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SO2 + O₂ = SO3