In the reaction AI+3O2->2AI2O3 what coefficient should be placed in front of the AI to balance the reaction 1,2,3,4

To balance the reaction, we should put a 4 in front of Al

Explanation:

Step 1: Data given

AI+3O2->2AI2O3

Step 2: Balance the equation

On the right side we have 2*3 = 6 oxygen atoms

On the left side we have 3*2 = 6 oxygen atoms as well, so those are on both side balanced

On the right side we have 2*2 = 4 Al atoms

On the left side we have only 1 Al atom

We should multiply this by 4 (place a 4 in front of the Al)

4AI + 3O2 → 2AI2O3

Now al atoms are balanced on both sides.