Question

When the equation Fe3O4 + Al → Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
a
3
b
4
c
6
d
9

Answer 1

hello friend your answer is here ✌

in the left side the coefficient of Fe is 3
and in right .. coefficient of Fe is 9

3Fe3O4 + 8Al ➡4Al2O3 + 9Fe

thanks ☺

Answer 2

When the equation Fe3O4 + Al → Al2O3 + Fe is correctly balanced, the coefficient of Fe will be 9.

To balance a chemical equation we will count the number of atoms of all the elements in both reactant and products side and then use the hit and trial method to balance the number of atoms of each element on both sides.

Here in this reaction, we have Fe atoms, O atoms, and Al atoms. We will start with balancing O on both sides as O is not present in a free state.

3Fe3O4 + Al → 4Al2O3 + Fe

Now O is balanced on both sides. Now we will balance the number of Fe and Al atoms according to the added coefficients.

3Fe3O4 + 8Al → 4Al2O3 + 9Fe  

Now all the atoms are balanced on both sides.

We can see that the coefficient of Fe is 9.