# Is the following chemical equation balanced? 2Al + 30_2 -> 2Al_2O_3?

Mar 29, 2017

If you come into my shop and you receive change of £2-50 from a £10-00 note on a £6-50 purchase, have you been short-changed?

#### Explanation:

I think you would immediately recognize that you had been short-changed.

Now looking at the equation,

$2 A l + 3 {O}_{2} \rightarrow 2 A {l}_{2} {O}_{3}$,

on each side there are 6 oxygen atoms, but on the left hand side there are 2 aluminum atoms, and on the RHS, there are 4 aluminium atoms. And this the equation is UNBALANCED, and thus it CANNOT be accepted as a representation of chemical reality.

The stoichiometrically balanced equation has GARBAGE OUT EQUIVALENT TO GARBAGE IN..........i.e.

$4 A l + 3 {O}_{2} \rightarrow 2 A {l}_{2} {O}_{3}$

On the other hand, if you were presented with $2 + 4 = 10$, would you twig that the balance is shot?