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.

To know more about chemical equation, refer to the link:

link

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

i believe the answer is true.