pictured on the right is of a simple chemical reaction. The bolt and
the nut represent elements forming the compound (nut+bolt).
we can have too much of a particular reactant. In this case we have
too many nuts and not enough bolts.
How much of
the compound (nut+bolt) that is formed is determined by the number
of bolts. There is obviously not enough bolts to react with all the
nuts. As soon as the bolts are used up the reaction will cease. Two
units of the compound are formed and two nuts are left unreacted.
that is present in excess amount is known as the excess reactant,
while the reactant that will be used up is known as the limiting