Question

Balance the following reaction : Mg + O2  MgO

Answer 1

2MgO+O2--->2MgO

hope this is correct

Answer 2

Lhs. Rhs

Mg. 1. 1

O. 2. 1

If we multiply O by 2

It forms MgO2

Multiply 2on Me present in reactant side and in product side

2Mg+O2 gives 2MgO