Why the number of atoms of reactions must equal the number of atoms of products formed?

Answer 1

Because of the concept of conservation of mass. the mass remains unchanged because the chemical reaction is caused by the interaction of electrons with eachother as opposed to atoms actually destroying or combining with eachother

Answer 2

The law of conservation of mass/matter, states that matter can neither be created nor destroyed in a chemical reaction. Since atoms are matter, there must be the same numbers of atoms of each element on both sides of an equation that represents a chemical reaction.

Answer 3

In a reaction the reactants are the ingredients you start with and the products are what you end up with. Nothing can appear as if by magic and nothing can vanish. The atoms have to be the same atoms at the end as they were at the start, they just reorganise themselves. This does mean that the atoms that your body is made up of right now have been in the Universe for a very long time - made in stars and cycling endlessly between living and dead organisms and the earth itself. The hydrogen in your body is likely to be almost 13.7 billion years old, the first atoms to be made in the Universe.

Answer 4

Because matter is never created nor destroyed.

Answer 5

Only then it will obey the law of conservation of mass.

Answer 6

This is a consequence of the law of mass conservation.

Answer 7

balanced equation