Answer:
The first step would be to write a balanced reaction between Mg and O2 forming MgO
Explanation:
<u>Step 1: W</u>rite the balanced chemical reaction between Mg and O2

Based on the reaction stoichiometry:
2 moles of Mg produces 2 moles of MgO.
Therefore the ratio, Mg:MgO = 1:1
<u>Step 2</u>: Calculate the moles of Mg reacted
Atomic mass of Mg = 24 g/mol
Mass of Mg reacted = 28.0 g
Moles of Mg = 
<u>Step 3:</u> Calculate the mass of MgO produced
Moles of Mg reacted = moles of MgO produced = 1.167
Molar mass of MgO = 24 + 16 = 40 g/mol
Mass of MgO = 