If in Part B.2, the burning of the magnesium is uncontrolled (burns brightly), how will this procedural error affect the reported mass of:

Question

a Magnesium in the magnesium oxide? Explain.
B. oxygen in the magnesium oxide? Explain.

Answer 1

Let me explain and you do the rest.
Burning Mg in air leads both to MgO and Mg3N2.You want the MgO; you don't want the Mg3N2. The amount of MgO is reduced; the amount of oxygen in the MgO is reduced.

Answer 2

Ok, I think I get it now. Thank you so much!