Stoichiometry is the science that determines the exact proportion of elements to make pure chemical coumpounds, alloys such as semiconductors or ceramic crystals, therefore estequiométricos is the 'quality' of these calculations....

stoichiometric (adjective) é o adjetivo de stoichiometry

stoichiometrically (adverb)
stoichiometry (noun) substantivo
definiçao:
1. branch of chemistry: the branch of chemistry concerned with measuring the proportions of elements that combine when chemical reactions take place
2. measure: a measure of the relative proportions of the chemical elements that take part in a chemical reaction
(source: Encarta)

depende do contexto em que se for usar a palavra.

boa sorte

Vivian