What is the branch of chemistry that examines numerical relationships in chemical reactions? thermodynamics analysis kinetics stoichiometry?

Stoichiometry is the branch of chemistry that examines numerical relationships in chemical reactions. It is based on the Law of Conservation of Mass. Every chemical reaction has the same elements in its reactants and products, though the elements they are paired up with often change in a reaction.

I’m a leo purrr and I’m pretty sure it’s number 4