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The reaction stoichiometry states that 1 mole of A will react with 2 moles of B to produce 1 mole of AB2. Since we need 2 moles of B to completely react with 1 mole of A, we will run out of B first (there is only one mole of B available). Whatever reactant runs out first is called the limiting reactant or limiting reagent. Thus B is the limiting reagent in the above scenerio. The reaction stops after the limiting reagent runs out. In the above case 1 mole of B reacts with 0.5 mol of A to produce 0.5 mole of AB2 with 0.5 mol of A unreacted.
Reagents, such as sulfur (pictured), are the starting materials that are used in chemical reactions. A reagent /riËeÉªdÊÉnt/ is a substance or compound added to a system to cause a chemical reaction, or added to see if a reaction occurs. The terms reactant and reagent are often used interchangeablyâhowever, a reactant is more specifically a substance consumed in the course of a chemical reaction. Solvents, though involved in the reaction, are usually not called reactants. Similarly, catalysts are not consumed by the reaction, so are not reactants.