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2 Limiting Reactant This is the chemical that is used completely in a reaction. Also called limiting reagent. [http://www.mhhe.com/physsci/chemistry/chang7/esp/folder_structure/cr/m2/s3/assets/images/crm2s3_1.jpg]

3 Limiting Reactant Al 2 O 3 + NaCl  AlCl 3 + Na 2 O If you have 18.0 moles of NaCl and 2.50 moles of Al 2 O 3, which is the limiting reactant? Hint: Solve reaction twice for same product. (AlCl 3 for this demo…) 6 23

4 18.0 mol NaCl 6 mol NaCl 2 mol AlCl 3 = 6.00 mol AlCl mol Al 2 O 3 1 mol Al 2 O 3 2 mol AlCl 3 = 5.00 mol AlCl 3 The reactant that creates the smaller amount is limiting! Al 2 O NaCl  2 AlCl Na 2 O

5 Limiting Reactant Na + CaCl 2  NaCl + Ca If you start with 57.5 g of Na and 111 g of CaCl 2, how many grams of Ca will you have at the end of the reaction? Hint: solve the question twice… 22

6 57.5 g Na1 mol Na 23.0 g Na2 mol Na 1 mol Ca 40.1 g Ca =50.1 g Ca 111 g CaCl 2 1 mol CaCl g CaCl 2 1 mol CaCl 2 1 mol Ca 40.1 g Ca =40.1 g Ca 2 Na + CaCl 2  2 NaCl + Ca

7 Limiting Reactant 40.1 g of Ca is produced from the 111 g of CaCl 2 The CaCl 2 is the limiting reactant.


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