Is it possible that after a chemical reaction the proportion of the atom can change?

 Dear Student
 No, it is not possible to change the stoichiometry of atoms after a chemical reaction. The product/s of a chemical reaction is definite.

According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction.
Thus in a chemical reaction, the only rearrangement of atoms occurs to give a new product.

This is the reason why we balance the chemical equation. 
H2 + O2 -> 2H2O
H2 + O2 -> H2O2
Although second equation is balanced, H2 and O2 do not combine to form hydrogen peroxide rather it forms water

Regards

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