How does stoichiometry operate in chemical reactions?
I hope to be of some help. Let's try the combustion of methane as an example of a chemical reaction.
The balanced equation for the combustion of methane is given by:
This equation is balanced stoichiometrically. What does it tell us? It tells us that
Because of the molar equivalence, i.e. the mass of a given mole of stuff, we could also say that
It is worth noting that here that mass is conserved in every chemical equation. You start with
Such stoichiometry is also practised in other scenarios: banking, finance, accounting, even a simple transaction at the supermarket. You buy goods worth
This same stoichiometry operates in every chemical equation.
To end, you might say to me that you don't know how to balance a hydrocarbon combustion. I can guarantee that you know how to balance a cash transaction when you go shopping. You KNOW when you have been short-changed; likewise, you know when you have received too much change (and of course you give it back!). Don't short change your chemical equations; stoichiometry always operates.