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- The reactant in a chemical reaction that remains when a reaction stops when the limiting reactant is completely consumed.
A balanced chemical equation shows the molar amounts of reactants that will react together to produce molar amounts of products.
In the real world, reactants are rarely brought together with the exact amount needed.
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Again, if we're given a problem where we know the quantities of both reactants, all we need to do is figure out how much product will be formed from each.
The smaller of these quantities will be the amount we can actually form.
One reactant will be completely used up before the others.
The reactant used up first is known as the limiting reactant.