1. Stoichiometry Jeopardy
Percent Yield
Mass-Mass
Mass-Volume
Limiting
Reactants
“Stoiched” About Chemistry
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Final Jeopardy

2. Mg + HCl -------> MgCI2 + H2
$100 Mass-Mass
If 20.0 g of magnesium react with excess hydrochloric acid, how many grams of magnesium chloride will be produced?
Mg + HCl > MgCI2 + H2

3. $100 Answer from Mass-Mass
39.2g MgCl2

4. Al + Fe2O3 ------> Fe + Al2O3
$200 Mass-Mass
How many grams of aluminum would be required to produce 550 g of Fe using the
following reaction?
Al + Fe2O > Fe + Al2O3

5. $200 Answer from Mass-Mass
265.1g Al

6. $300 Mass-Mass
What mass of oxygen is needed to completely react with 84.9 g of Fe according to the
following reaction?
Fe + O2 ----> Fe2O

7. $300 Answer from Mass-Mass
12.2g O2

8. $400 Mass-Mass
Sodium oxide reacts with water to produce sodium hydroxide. What mass of sodium oxide must be used to produce 275 grams of sodium hydroxide?

9. $400 Answer from Mass Mass
212.9g Na2O

10. $500 Mass Mass
When butane, C4H10 burns in oxygen, the products are carbon dioxide and water. What
mass of carbon dioxide will be produced when 4.42 g of butane is burned in excess
oxygen?

11. $500 Answer from Mass Mass
13.35g CO2

12. $100 Mass-Volume
In the following equation, what volume of hydrogen gas is produced when 135 grams of aluminum are completely reacted with excess sulfuric acid?  
  2 Al    +  3  H2SO >    3 H2      +    Al2(SO4)3

13. $100 Answer from Mass-Volume
168.6 L H2

14. $200 Question from Mass-Volume
In the  reaction below, how many liters of   ammonia gas are produced when 35 grams of liquid nitrogen completely react with excess hydrogen?
      N 2       +       3H2         >        2 NH3

15. $200 Answer from Mass-Volume
56.0 L NH3

16. $300 Question from Mass-Volume
What volume of oxygen is produced in the decomposition reaction of g sodium chlorate ?
NaClO3  NaCl O2

17. $300 Answer from Mass-Volume
15.3 L O2

18. $400 Question from Mass-Volume
How many grams of Al2O3 will be formed from 17.4 liters of O2?
Al + O2  Al2O3

19. $400 Answer from Mass-Volume
58.2 g Al2O3

20. $500 Question from Mass-Volume
How many liters of carbon dioxide will form from the combustion grams of C5H12 with excess oxygen?

21. $500 Answer from Mass-Volume
497.8 L CO2

22. $100 Question from % Yield
Calculate the theoretical yield of Calcium Oxide if 24.8 grams of Calcium Carbonate decomposes. Calculate the percent yield if you got 13.1 grams in the laboratory.
CaCO3 → CaO CO2

23. $100 Answer from % Yield
94%

24. $200 Question from % Yield
What is the percent yield if you experimentally produce 3.65 grams of copper when 1.87 grams of Aluminum reacts with 9.65 grams of Copper (II) Sulfate?
Al CuSO4 → Cu Al2(SO4)3

25. $200 Answer from % Yield
95%

26. $300 Question from % Yield
There are grams of each reactant available. Determine the limiting reactant in this equation.
SO NaOH → Na2SO H2O

27. $300 Answer from % Yield
LR=NaOH

28. $400 Question from % Yield
Find the theoretical yield of silicon carbide if 50.0 grams of silicon dioxide reacts with 79.1 grams of Carbon.
 SiO C → SiC CO

29. $400 Answer from % Yield
33.3g SiC

30. $500 Question from % Yield
What is the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained?
CaCO HCl → CaCl CO H2O

31. $500 Answer from % Yield
56.6%

32. $100 Question from Limiting Reactants
If 10.4 moles of hydrogen, H2, and 9.1 moles of oxygen, O2, are placed together in a container and allowed to react according to the equation. How many moles of water, H2O, would be produced by the reaction?
2 H2 + O2  2 H2O

33. $100 Answer from Limiting Reactants
10.4 mol H2O

34. $200 Question from Limiting Reactants
If 83.7 grams of aluminum, Al, and grams of sulfur, S, are put into a container and allowed to react according to the above equation, which substance(s) and how many grams of each would be present in the container after the reaction is complete?
2 Al S  Al2S3

35. $200 Answer from Limiting Reactants
LR= Al

36. $300 Question from Limiting reacatants
If grams of vanadium (II) oxide, VO, and 832 grams of iron (III) oxide, Fe2O3,
are put into a container and allowed to react according to the equation above, which substance(s) and how many grams of FeO would be present in the container after the reaction is complete?
2 VO Fe2O3  6 FeO + V2O5

37. $300 Answer from Limiting Reactants
748.6g FeO

38. $400 Question from Limiting Reactants
Methyl alcohol (wood alcohol), CH3OH, is produced via the reaction
CO(g) + 2 H2(g)  CH3OH(l)
A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to react.
Which reagent is the limiting reagent?

39. $400 Answer from Limiting Reactants
8.5g CH3OH

40. $500 Question from Limiting Reactants
A welder has 20.0 moles of acetylene gas (C2H2) and 10.0 moles of oxygen gas (O2). They combine
to form water and carbon dioxide. Identify the limiting reactant. How many moles of carbon dioxide
gas (CO2) will form?

41. $500 Answer from Limiting Reactants
O2 yields 8.0 mol CO2
C2H2 yields 40.0 mol CO2
O2 is the limiting reactant

42. $100 Question from “Stoiched” About Chemistry
0.300 moles of bromine gas (Br2) and moles of chlorine gas (Cl2) react to form tribromochlorine (Br3Cl). How many moles of this product will form?

43. $100 Answer from “Stoiched” About Chemistry
0.2 mol Br3Cl

44. $200 Question from “Stoiched” About Chemistry
Determine the % yield when 7.80 grams of benzene (C6H6) burns in oxygen gas to form 3.00 grams
of CO2 gas and water vapor.

45. $200 Answer from “Stoiched” About Chemistry
11.5%

46. $300 Question from “Stoiched” About Chemistry
25.3 g of magnesium reacts with 44.3 g of copper (II) nitrate to form copper and magnesium nitrate.
What mass of copper will form? What mass of reactants will remain unreacted?

47. $300 Answer from “Stoiched” About Chemistry
16.Og Cu will form
19.3 g un-reacted reactants

48. $400 Question from “Stoiched” About Chemistry
2 NH O2  N2O H2O
If 80.0 grams of O2 are reacted in the above reaction, how many grams of N2O will be produced?

49. $400 Answer from “Stoiched” About Chemistry
55.2g N2O

50. $500 Question from “Stoiched” About Chemistry
Methyl alcohol (wood alcohol), CH3OH, is produced via the reaction
CO(g) + 2 H2(g)  CH3OH(l)
A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to react.
Which reagent is the limiting reagent?
What is the yield of CH3OH?
[Assume theoretical yield ing is what is wanted here.]
How much of the reagent present in excess is left over?
Suppose the actual yield is 7.52 g of CH3OH. What is the % yield?

51. $500 Answer from “Stoiched” About Chemistry

52. Final Jeopardy Question
Silicon nitride (Si3N4), a ceramic, is made by the direct combination of silicon and nitrogen at high temperature. How much silicon must react with excess nitrogen to prepare 125 grams of silicon nitride if the yield of the reaction is 95%?

53. Final Jeopardy Answer
70.1g Si