Answer:
Well for any equation if all the coefficients are set to 1, this might result in unequal numbers of atoms of the same element on both sides
Explanation:
For example:
[tex]A+B---->B_{2} + A_{2}[/tex] (for this equation all the coefficient (the number before element) are 1 but you can clearly see it is not balanced because one side has 1 A atom and other side has 2 B atoms....therefore we need to balance em.
[tex]2A+2B-----> A_{2} + B_{2}[/tex] Here both atoms are balanced.
