It's been so long, Honda, I had to look it up. Yeah, I think
  Stoichiometry is the CLOSEST POINT between molecular chemistry
  and theoretical physics and mathematics. It depends on ideal
  forms.* The system it's working is a theoretical perfect closed
  system where no mass is wasted.... ...and you really just have
  to trust that it's true because there's no ideal closed
  environments... there's no ideal gas... and what you get is a
  "close enough to be functional" answer, while using all this
  extreme precision. I remember it now.* Being part of Classical
  Science (Stoichiometry, pre 20th Century... pre 19th
  Century...), it was hard for me to accept it completely because
  I had already been exposed (mostly through hobby reading) to
  quantum mechanics and relativity and complexity theories. I kept
  arguing with the chemistry teacher.* "But but but..." and all he
  could say is, "I know, I know but you just have to deal with it
  because we haven't connected the two yet very well and we might
  never be able to". Ugh.
  To analogize to biology and "naming things", it's behavioral
  biology.* Group dynamics of particular species in a perfect rave
  listening to perfect raving music and who pickpockets whom and
  who puts date rape drugs in whose drinks and what dances they
  are dancing.... ...in a vacuum ...with no visible electricity
  ...and no gravity... ...and everybody is PERFECTLY spaced apart
  in a Brownian motion (ideal gas) ..and no DJ But at least with
  molecular chemistry, they have arms and legs... sometimes...