Question

write the balanced chemical equation when Magnesium is burnt in air​

Answer 1

The increase in mass is due to the fact that oxygen from the air has combined with the magnesium to make magnesium oxide, MgO. The chemical equation, Mg + O2 MgO shows this reaction but it needs to be balanced to make 2Mg + O2 2MgO.

Answer 2

2Mg+O2------->2MgO

hope it will help u