The atom scale diagram shown can be used to show that the balanced reaction equation is; 4SO2 + 5O2 -----> 4SO3 + 3O2
To balance a chemical reaction, the number of atoms of each element on the reactant side must be the same as the total number of atoms of each elements on the product side.
Don't forget that we are using the atom - scale pictures given in the question as guide.
On the sphere on the left we have four SO2 molecules and five oxygen molecules. In the sphere on the left we have four SO3 molecules and three oxygen molecules.
The balanced reaction equation is;
4SO2 + 5O2 -----> 4SO3 + 3O2
Initial: 4 5 0 0
Change: -4 -5 +4 +3
Final: 0 0 4 3
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