If the burning of magnesium is incomplete how will this procedural error affect the reported mass of 1) magnesium in magnesium oxide? explain 2) oxygen in magnesium oxide? explain

If the burning of magnesium to form magnesium oxide is incomplete, there will still br some elemental magnesium available to be burned (ie combined with oxygen) and so there will be a measureable amount of mass of magnesium left. Also, the amount of oxygen required to combine with the outstanding mass of magnesium could also be determined.