Balanced equation
2SO2 + O2 ----> 2SO3
Number of moles = mass in gram / Molar mass
Molar mass of SO2 = 64.07 g/mol
Molar mass of O2 = 32 g/mol
Molar mass of SO3 = 80.07 g/mol
Number of moles of SO2 = 5.80 g / 64.07 g/mol = 0.0905 mol
Number of moles of O2 = 2.45 g / 32 g/mol = 0.0766 mol
From reaction, 2.0 mol of SO2 reacts with 1.0 mol of O2 produces 2.0 mol of SO3 then 0.0905 mol of SO2 will react with 1.0 mol * 0.0905 mol / 2.0 mol = 0.04525 mol of O2 will produce 0.0905 mol of SO3.
Since SO2 is reacting completely during the reaction so SO2 is limiting reagent.
Number of moles of SO3 formed = 0.0905 mol
Mass of SO3 produced = 0.0905 mol * 80.07 g/mol = 7.25 g
Since O2 is not reacting completely during the reaction so O2 was excess reagent.
Number of excess reagent O2 remaining = (0.0766 - 0.04525) mol = 0.03135 mol
Mass of excess reagent O2 remaining = 0.03135 mol * 32 g/mol = 1.00 g
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