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LIMITING Reactant (REAGENT) PROBLEMS

LIMITING Reactant (REAGENT) PROBLEMS. LIKE BAKING A CAKE . 1. What is a Limiting Reagent?. If reactants are added to a container in amounts that differ from the required reaction stoichiometry then some reactants will not be completely used in the reaction.

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LIMITING Reactant (REAGENT) PROBLEMS

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  1. LIMITING Reactant (REAGENT)PROBLEMS LIKE BAKING A CAKE

  2. 1. What is a Limiting Reagent? If reactants are added to a container in amounts that differ from the required reaction stoichiometry then some reactants will not be completely used in the reaction. Limiting Reactant(Reagent) The reactant that is entirely consumed in a reaction. The reaction stops when the limiting reactant is used up. Excess Reactant(Reagent) The reactant(s) that are left over after a reaction is completed.

  3. Examples of Limiting Reactants Baking a cake: 2 cups flour + 1 egg → 1 cake 4 cups flour + 2 eggs? How many cakes? = 2 cakes 2 cups flour + 2 eggs? How many cakes? 2 cups flour + 2 eggs → 1 cake 1 egg The amount of product formed is determined by the starting amount of the limiting reagent.

  4. 2. Examples of Limiting Reactants KI is limiting Pb(NO3)2 is limiting Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

  5. N2 + 3 H2 2 NH3 2 molecules of NH3 will be produced when 3 molecules of H2 react with 1 molecule of N2. What would happen if 3 molecules H2 reacted with 2 molecules of N2? Would it make more than 2 molecules of NH3? NO!! All 3 of H2 is used up when it reacts with 1 of N2. This reaction will make 2 of NH3 and have 1 N2 left over. This is called a limiting reagent reaction b/c it determines the amount of product that can be formed. The reaction occurs only until the limiting reagent is used up.

  6. Ex.1 2 Na + Cl2 2 NaClDetermine each of the following if 6.70 moles of Na reacts with 3.80 moles of Cl2. • What is the limiting reagent? b) How many moles of NaCl are produced? c) How much excess reagent is leftover?

  7. Ex.2) Calculate the maximum number of grams formed when 80.0 g Cu reacts with 25.0 g S.2 Cu + S Cu2S

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