Solid sodium peroxide (Na2O2) reacts with carbon dioxide gas to form solid sodium carbonate and oxygen gas. If I have 56.2 g of Na2O2 and I treat it with 2.4 L of carbon dioxide at 675 Torr and 23.6 „aC, how many grams of sodium carbonate will be produced?

Answer 1

This is a limiting reagent (LR) problem. You know that because an amount is given for BOTH reactants. I work these the long way.
Na2O2 + CO2 ==> Na2CO3 + O2
Use PV = nRT and solve for n = number of mols CO2 at the conditions listed.

mols Na2O2 = grams/molar mass

Use the coefficients in the balanced equation to convert mols CO2 to mols Na2CO3.
Do the same and convert mols Na2O2 to mols Na2CO3.
It is likely that the two values will not agree; the correct value in LR problem is ALWAYS the smaller value.

Using the smaller value, convert mols Na2CO3 to g. g = mols x molar mass = ?