Fill in the blank with the correct number to balance the equation: 4al + → 2al2o3. (enter only a whole number.) numerical answers expected!

Here is the balanced equation:

                         4Al + 3 O2 → 2Al2O3.

Explanation:

The equation shows an oxidation-reduction process. To balance the no. of atoms of oxygen, we have to count the number of oxygen atoms in the product.

Now let's come towards reactants:

We see that two oxygen atoms are present in O2 form, if we add 3 behind O2, the total number of O atoms will become. Since, Al atoms are already balanced we do not need to balance those. Hence, adding just 3 behind O2 will balance the equation completely.

Hope it helps! :)

3 oxygen molecule are required to form 2 Aluminium oxide.

An equation is balanced when the number of atom in both the side is equal.

The given reaction is,

We can see there are 6 oxygen atom in product while only 2 oxygen atom on reactant side.

So,

Hence, we can conclude that 3 oxygen molecule are required to form 2 Aluminium oxide.

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