What does "stoichiometric amounts" mean? Can anyone inform me what the term stoichiometric amounts means? I know what stoichiometry means. It is the: 


  The relationship between the relative quantities of substance taking part in a reaction or forming a compound.


But what is "stoichiometric amount" supposed to be?
Sometimes, practical chemistry does not work like it's supposed to on paper. A perfectly balanced reaction equation may dictate that two reactants should be in a 1:1 stoichiometric ratio, but in practice, you get much better yields or reaction times if you use an excess of one.

When that happens, you are no longer using a stoichiometric amount, as specified by the balanced equation, but a super- or substoichiometric amount.

Welcome to chemistry in the real world.