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Warm Up:

Warm Up:. Balance the below equation and answer the multiple choice question. ___H 2 + ___O 2  ___H 2 O. 2 1 2. Limiting Reagent. Limiting Reagent (Reactant).

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Warm Up:

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  1. Warm Up: • Balance the below equation and answer the multiple choice question. ___H2 + ___O2 ___H2O 2 1 2

  2. Limiting Reagent

  3. Limiting Reagent (Reactant) • If you do a chemical reaction and one of the chemicals gets used up before the other one, the one that got used up is called the limiting reagent • Controls the quantity of product

  4. 2 bread + 1 cheese = 1 grilled cheese

  5. 2 bread + 1 cheese = 1 grilled cheese What is the limiting reagent? What is the theoretical yield (how many grilled cheese can I make)? cheese 2

  6. Steps • Check to be sure you have a balanced equation • Convert the amount of each of the reagents into the amount of product that you could form if that reagent was completely consumed. • Determine which of the answers produced the • LEAST amount of product and that will be your limiting reagent. • Also the LEAST amount of product will be your theoretical yield.

  7. 2 Al + 3 I2 ------> 2 AlI3 • What is the limiting reagent and the theoretical yield if 108 g of Aluminum reacts with 635 g of Iodine? Aluminum= 108 g x 1 mol Al = 4 mol Al 27 g 4 mol Al x 2 mol AlI3 = 4 mol AlI3 2 mol Al Iodine = 635 g x 1 mol I2 = 2.5 mol I2 254 g 2.5 mol I2 x 2 mol AlI3 = 1.66 mol AlI3 3 mol I2

  8. CuCl2 +Na2NO3CuNO3 + NaCl • If 15 g of CuCl2 reacts with 20 g of Na2NO3 how much NaCl can be formed? What is the limiting reagent? 1CuCl2 +1Na2NO31CuNO3 + 2NaCl

  9. 15 g CuCl2 x 1 mol = 0.11 mol CuCl2 134.5 g 0.11 mol CuCl2 x 2 mol NaCl = 0.22 mol NaCl 1 mol CuCl2 • 20 g Na2NO3 x 1 mol = 0.185 mol Na2NO3 108 g 0.185 mol Na2NO3 x 2 mol NaCl = 0.37 mol NaCl 1 mol Na2NO3

  10. CuCl2 = limiting reagent • Theoretical yield= 0.22 mol NaCl

  11. Excess • 0.22 mol NaCl x 1mol Na2NO3 2 mol NaCl 0.11 mol Na2NO3 were used 0.185-0.11= 0.075 mol excess

  12. For the following reaction, find the following: a)Which of the reagents is the limiting reagent? b)What is the theoretical yield of (NH4)3PO4 in grams? 3 NH4NO3 + Na3PO4 (NH4)3PO4 + 3 NaNO3 Assume we started with 30 grams of ammonium nitrate and 50 grams of sodium phosphate.

  13. ammonium nitrate • 18.6 grams of ammonium phosphate

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