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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]

Limiting Reactant Al2O3 + NaCl  AlCl3 + Na2O If you have 18.0 moles of NaCl and 2.50 moles of Al2O3, which is the limiting reactant? Hint: Solve reaction twice for same product. (AlCl3 for this demo…) 6 2 3

The reactant that creates the smaller amount is limiting! Al2O3 + 6 NaCl  2 AlCl3 + 3 Na2O 18.0 mol NaCl 2 mol AlCl3 = 6.00 mol AlCl3 6 mol NaCl The reactant that creates the smaller amount is limiting! 2.50 mol Al2O3 2 mol AlCl3 = 5.00 mol AlCl3 1 mol Al2O3

Limiting Reactant Na + CaCl2  NaCl + Ca 2 2 If you start with 57.5 g of Na and 111 g of CaCl2, how many grams of Ca will you have at the end of the reaction? Hint: solve the question twice…

2 Na + CaCl2  2 NaCl + Ca 57.5 g Na 1 mol Na 1 mol Ca 40.1 g Ca 23.0 g Na 2 mol Na 1 mol Ca =50.1 g Ca 1 mol CaCl2 1 mol Ca 111 g CaCl2 40.1 g Ca 1 mol CaCl2 111.1 g CaCl2 1 mol Ca =40.1 g Ca

Limiting Reactant 40.1 g of Ca is produced from the 111 g of CaCl2 The CaCl2 is the limiting reactant.