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In a chemical reaction, if the reacting substance are mixed together in exact proportions as given by the equation (referred to as stoichiometric quantities), then all the reactants will be completely and simultaneously used up at the end of the reaction.
However, if the quantity of one of the reactants is in excess, then the reactants which is the first to be used up in the reaction is called a limiting reactant.
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What is he staring at?
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