Balance this chemical equation. Choose "blank" for the box if no other coefficient is needed. Writing the symbol implies "1." Al + O2 → Al2O3
what blanks
2 and 3 make 6
6O's have to be on both sides
times right sides by 2
AL4O6
now on left side
times AL by 4
O by 3
blanks are stuff in parenthasees
(4)AL+(3)O2->(2)AL2O3