2. Stoichiometry Jeopardy Percen t Yield Limiting Reactan ts “Stoiche d” About Chemist ry Q $100 Q $200 Q $300 Q $400 Q $500500 Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Final Jeopardy Gram s Mole s To Molecu les

3. $100 Grams Moles If you have 20.0g of magnesium sulfate, how many moles do you have?

4. $100 Answer from Grams Moles 0.17 mol MgSO 4

5. $200 Grams Moles How many grams of aluminum oxide would you have if you started with.109 moles?

6. $200 Answer from Grams Moles 11.11g Al 2 O 3

7. $300 Grams Moles What mass of Fe 2 O if you are have 2.5 moles of Fe 2 O?

8. $300 Answer from Grams Moles 319.25 g Fe 2 O

9. $400 Grams Moles 275 grams of sodium hydroxide is equal to many moles?

10. $400 Answer from Grams Moles 6.88 mol NaOH

11. $500 Grams Moles C 4 H 10 burns in oxygen, the products are carbon dioxide and water. What is the mass of C 4 H 10 when given 4.42 moles?

12. $500 Answer from Grams Moles 256.98g C 4 H 10

13. $100 to Molecules How many atoms are in 3,250 g Pb?

14. $100 Answer from to Molecules 9.44x10 24 atoms Pb

15. $200 Question from to Molecules How many moles are in 3.011 x 10 23 atoms Mg?

16. $200 Answer from to Molecules 0.50 moles

17. $300 Question from to Molecules How many molecules are there in 7.02 g SiO 2 ?

18. $300 Answer from to Molecules 7.03 x 10 22 molecules

19. $400 Question from to Molecules What is the mass in grams of 3.011 x 10 23 atoms F?

20. $400 Answer from to Molecules 9.50 g Fe

21. $500 Question from to Molecules How many molecules is 320.0 grams of C 5 H 12 ?

22. $500 Answer from to Molecules 2.67 x 10 24 molecules C 5 H 12

23. $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. CaCO 3 → CaO + CO 2

24. $100 Answer from % Yield 94%

25. $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 + CuSO 4 → Cu + Al 2 (SO 4 ) 3

26. $200 Answer from % Yield 95%

27. $300 Question from % Yield There are 100.0 grams of each reactant available. Determine the limiting reactant in this equation. SO 2 + 2NaOH → Na 2 SO 3 + H 2 O

28. $300 Answer from % Yield LR=NaOH

29. $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 2 + C → SiC + CO

30. $400 Answer from % Yield 33.3g SiC

31. $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 actually obtained? CaCO 3 + HCl → CaCl 2 + CO 2 + H 2 O

32. $500 Answer from % Yield 56.6%

33. $100 Question from Limiting Reactants If 10.4 moles of hydrogen, H 2, and 9.1 moles of oxygen, O 2, react. How many moles of water, H 2 O, would be produced by the reaction? 2 H 2 + O 2  2 H 2 O

34. $100 Answer from Limiting Reactants 10.4 mol H 2 O

35. $200 Question from Limiting Reactants If 83.7 grams of aluminum, Al, and 195.2 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 + 3 S  Al 2 S 3

36. $200 Answer from Limiting Reactants LR= Al

37. $300 Question from Limiting reacatants If 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron (III) oxide, Fe 2 O 3, 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 + 3 Fe 2 O 3  6 FeO + V 2 O 5

38. $300 Answer from Limiting Reactants 748.6g FeO

39. $400 Question from Limiting Reactants CO (g) + 2 H 2(g)  CH 3 OH (l) A mixture of 1.20 g H 2 and 7.45g CO are allowed to react. Which reagent is the limiting reagent?

40. $400 Answer from Limiting Reactants CO

41. $500 Question from Limiting Reactants A welder has 20.0 moles of acetylene gas (C 2 H 2 ) and 10.0 moles of oxygen gas (O 2 ). They combine to form water and carbon dioxide. How many moles of carbon dioxide gas (CO 2 ) will form?

42. $500 Answer from Limiting Reactants O 2 yields 8.0 mol CO 2

43. $100 Question from “Stoiched” About Chemistry 0.300 moles of bromine gas (Br 2 ) and 0.500 moles of chlorine gas (Cl 2 ) react to form tribromine monochloride (Br 3 Cl). How many moles of this product will form?

44. $100 Answer from “Stoiched” About Chemistry 0.2 mol Br 3 Cl

45. $200 Question from “Stoiched” About Chemistry Determine the % yield when 7.80 grams of benzene (C 6 H 6 ) burns in oxygen gas to form 3.00 grams of CO 2 gas and water vapor.

46. $200 Answer from “Stoiched” About Chemistry 11.5%

47. $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?

48. $300 Answer from “Stoiched” About Chemistry 16.Og Cu will form

49. $400 Question from “Stoiched” About Chemistry 2 NH 3 + 2 O 2  N 2 O + 3 H 2 O If 80.0 grams of O2 are reacted in the above reaction, how many grams of N2O will be produced?

50. $400 Answer from “Stoiched” About Chemistry 55.2g N 2 O

51. $500 Question from “Stoiched” About Chemistry CO (g) + 2 H 2 (g)  CH 3 OH (l) A mixture of 1.20 g H 2 and 7.45 g CO are allowed to react. Suppose the actual yield is 7.52 g of CH 3 OH. What is the % yield?

52. $500 Answer from “Stoiched” About Chemistry 88.26 %

53. Final Jeopardy Question Silicon nitride (Si 3 N 4 ), 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?

54. Final Jeopardy Answer 75.07g Si