Question

What coefficients balance the equation _ Al + _ O2 → _ Al2O3?

Answer 1

4Al+ 3O2 --> 2Al2O3

Answer 2

you have 4 Al and 6 O on both sides

Answer 3

Al+O2-->Al2O3
Write down the number of atoms that you have on each side of the equation.
On the reactant side: 1 Aluminium, 2 oxygen
On the product side: 2 aluminium, 3 oxygen
Add a coefficient of 3 to O2 and a 2 to Al2O3.
Al+3O2-->2Al2O3
On the reactant side: 1 Aluminium, 6 oxygen
On the product side: 4 aluminium, 6 oxygen
Add a coefficient of 4 to Al
4Al+3O2-->2Al2O3

Answer 4

I was gonna say "Let me at this" but that Abmon98 had it waaay better. Medal for him.

Answer 5

thanks @spray_N_Pray :D