Formic acid, HCHO2, burns in oxygen to form carbon dioxide and water as follows:
____HCHO2(aq) + ____O2(g) → CO2(g) + H2O(l)
If a 3.15-g sample of formic acid was burned in 2.85g of oxygen, what mass of carbon dioxide would be produced? (Assume the reaction occurs at standard temperature and pressure, STP.)