# #29 When 84.8 g of iron (III) oxide reacts with excess of carbon

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#29 When 84.8 g of iron (III) oxide reacts with excess of carbon
monoxide, iron is produced. Fe2O3(s) CO(g)  2Fe(s) + 3CO2(g) What is the theoretical yield (how much iron do you expect to make?) of this reaction? 84.8 g Fe2O3 1 1 mole Fe2O3 159.7 g Fe2O3 2 mole Fe 1mole Fe2O3 55.85 g Fe 1mole Fe X X X = g Fe

#30 When 5.00 g copper reacts with excess silver nitrate, silver metal
and copper (II) nitrate are produced. What is the theoretical yield of silver in this reaction? Cu(s) AgNO3(aq)  2Ag(s) + Cu(NO3)2(aq) 5.00 g Cu 1 1 mole Cu 63.55 g Cu 2 mole Ag 1 mole Cu 107.9 g Ag 1 mole Ag X X X = g Ag

#31 If 50.0 g of silicon dioxide is heated with an excess of carbon,
27.9 g of silicon carbide is produced. SiO2(s) C(s)  SiC(s) + 2CO(g) What is the % yield in this reaction? First calculate the theoretical yield: 50.0 g SiO2 1 1 mole SiO2 60.09 g SiO2 1 mole SiC 1 mole SiO2 40.09 g SiC 1 mole SiC X X X = g SiC theoretical 27.9 g SiC X 100 = % yield 33.36 g SiC Formula for % yield: actual yield X 100 theoretical yield:

#32 If 15.0 g of nitrogen reacts with 15.0 g of hydrogen, 10.5 g of
ammonia is produced. What is the percent yield of this reaction? N H2  2NH3 calculate the theoretical yield for both nitrogen and hydrogen separately The one that produces the least ammonia determines the theoretical yield, then use that value to determine the % yield: 15.0 g N2 1 1 mole N2 28 g N2 2 mole NH3 1 mole N2 17 g NH3 1 mole NH3 X = X X 18.2 g NH3 15.0 g H2 1 1 mole H2 2.0 g H2 2 mole NH3 3 mole H2 17 g NH3 1 mole NH3 = 85 g NH3 X X X 10.5 g NH3 X 100 = % 18.2 g NH3

If a reactant runs out, the reaction must
#33 In a chemical reaction, how does an insufficient quantity of a reactant affect the amount of product formed? If a reactant runs out, the reaction must stop. It is like building bicycles, if you run out of one piece you stop building bicycles.

#34 How can you gauge the efficiency of a reaction carried out
in the laboratory? You can compare your results in the lab with the theoretical results that you can calculate. You can determine the % yield that you got compared with what might be expected with purely calculated values.

#35 What is the percent yield if 4.65 g of copper is produced
when 1.87 g of aluminum reacts with an excess of copper (II) sulfate? 2 Al(s) CuSO4(aq) Al2(SO4)3(aq) Cu(s) 1.87 g Al 1 1 mole Al 27.0 g Al 3 moles Cu 2 moles Al g Cu 1 mole Cu X X X = 6.6 g Cu theoretical 4.65 g Cu X = 70.5% 6.6 g Cu Formula for % yield: actual yield X 100 theoretical yield:

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