1) 4Na+O2=2Na2O
2) 4Al+3O2=2Al2O3
3) 2B+3O2=2B2O3
4) N+3H=NH3
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Answers & Comments
1) 4Na+O2=2Na2O
2) 4Al+3O2=2Al2O3
3) 2B+3O2=2B2O3
4) N+3H=NH3