Answer:
The coefficient of Al2O3 is 1
Step-by-step explanation:
Step 1: Data given
The unbalanced equation: Cu + Al2O3 → Al + CuO
Step 2: Balancing the equation
On the left side we have 2x Al (in Al2O3) on the right side we have 1x Al. To balance the amount of Al, we have to multiply Al on the right side by 2
Cu + Al2O3 → 2Al + CuO
On the left side we have 3x O (in Al2O3), on the right side we have 1x O (in CuO). To balance the amount of O, we have to multiply CuO on the right side, by 3
Cu + Al2O3 → 2Al + 3CuO
On the right side we have 3x Cu (in 3CuO), on the left side we have 1x Cu. To balance the amount of Cu on both sides, we have to multiply Cu (on the left side) by 3.
Now the equation is balanced.
3Cu + Al2O3 → 2Al + 3CuO
The coefficient of Al2O3 is 1