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1. Given the incomplete equation: 2N2O5(g) → Which set of products completes and balances the incomplete equation? 1) 2N2(g) + 3H2(g) 2) 2N2(g) + 2O2(g) 3) 4NO2(g) + O2(g) 4) 4NO(g) + SO2(g) 2. Given the reaction: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) What is the total number of grams of O2(g) needed to react completely with 0.50 mole of C2H2(g)? 1) 10. g 3) 80. g 2) 40. g 4) 160 g 3. When the equation __Al2(SO4)3 + __ZnCl2 → __AlCl3 + __ZnSO4 is correctly balanced using the smallest whole number coefficients, the sum of the coefficients is 1) 9 3) 5 2) 8 4) 4 4. Given the balanced equation: 3Fe + 4H2O → Fe3O4 + 4H2 What is the total number of liters of H2 produced at STP when 36.0 grams of H2O is consumed? 1) 22.4 3) 44.8 2) 33.6 4) 89.6 5. Given the reaction: 2Al + 3H2SO4 → 3H2 + Al2(SO4)3 The total number of moles of H2SO4 needed to react completely with 5.0 moles of Al is 1) 2.5 moles 3) 7.5 moles 2) 5.0 moles 4) 9.0 moles 6. Given the reaction: 2C2H6 + 7O2 → 4CO2 + 6H2O What is the ratio of moles of CO2 produced to moles of C 2H6 consumed? 1) 1 to 1 3) 3 to 2 2) 2 to 1 4) 7 to 2 7. Given the balanced equation: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) At STP, what is the total number of liters of hydrogen gas produced when 3.00 moles of hydrochloric acid solution is completely consumed? 1) 11.2 L 3) 33.6 L 2) 22.4 L 4) 44.8 L 8. Given the reaction: (NH4)2CO3 → 2NH3 + CO2 + H2O What is the minimum amount of ammonium carbonate that reacts to produce 1.0 mole of ammonia? 1) 0.25 mole 3) 17 moles 2) 0.50 mole 4) 34 moles 9. Given the reaction: 2NaOH + H2SO4 → Na2SO4 + 2H2O What is the total number of moles of NaOH needed to react completely with 2 moles of H2SO4? 1) 1 3) 0.5 2) 2 4) 4 10. Given the reaction: 4Na + O2 → 2Na2O How many grams of oxygen are completely consumed in the production of 1.00 mole of Na2O? 1) 16.0 3) 62.0 2) 32.0 4) 124 11. Given the unbalanced equation: __Al2(SO4)3 + __Ca(OH)2 → __Al(OH)3 + __CaSO4 When the equation is completely balanced using the smallest whole number coefficients the sum of the coefficients is 1) 5 3) 3 2) 9 4) 4 12. When the equation __Na(s) + __H2O(l) __NaOH(aq) + __H2(g) is correctly balanced using smallest whole numbers, the coefficient of the water is 1) 1 3) 3 2) 2 4) 4 13. Given the reaction: Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 What is the total mass of H2O produced when 32 grams of Cu is completely consumed? 1) 9.0 g 3) 36 g 2) 18 g 4) 72 g 14. When the equation __SiO2 + __C → __SiC + __CO is correctly balanced using whole-number coefficients, the sum of all the coefficients is 1) 6 3) 8 2) 7 4) 9 15. Given the unbalanced equation: __Na + __H2O → __H2 + __NaOH When the equation is correctly balanced using the smallest whole-number coefficients, the coefficient for H2 O is 1) 1 3) 3 2) 2 4) 4 16. Given the reaction: 2CO + O2 → 2CO2 What is the minimum number of moles of O2 required to produce one mole of CO2? 1) 1.0 3) 0.25 2) 2.0 4) 0.50 17. Given the reaction: 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O The total number of grams of Cu needed to produce 1.0 mole of Cu(NO3)2 is 1) 32 3) 128 2) 64 4) 192 18. Given the reaction: 2Na + 2H2O → 2NaOH + H2 How many moles of Na are needed to produce exactly 5.6 liters of H2, measured at STP? 1) 1.0 3) 0.50 2) 2.0 4) 0.25 19. Given the unbalanced equation: __CaSO4 + __AlCl3→Al2(SO4)3 + __CaCl2 What is the coefficient of Al2(SO4)3 when the equation is completely balanced using the smallest whole-number coefficients? 1) 1 3) 3 2) 2 4) 4 20. Given the unbalanced equation: __Li + __N2 → __Li3N When the equation is correctly balanced using smallest whole numbers, the coefficient of the lithium is 1) 1 3) 3 2) 2 4) 6 21. Given the unbalanced equation: __ Al(s) + __O2(g) → __Al2O3(s) When this equation is correctly balanced using smallest whole numbers, what is the coefficient of O2(g)? 1) 6 3) 3 2) 2 4) 4 22. Which equation is correctly balanced? 1) H2 + O2 → H2O 2) Ca + Cl2 → CaCl 3) 2H2 + O2 → 2H2O 4) Ca + C12 → Ca2Cl 23. Given the reaction: 2H2 + O2 → 2H2O The total number of grams of O2 needed to produce 54 grams of water is 1) 36 3) 61 2) 48 4) 75 24. Given the reaction: C3H8(g) + 5O2(g) → 4H2O(g) + 3CO2(g) What is the total number of liters of CO2 produced when 150 liters of O2 reacts completely with C3H8? 1) 90. 3) 3.0 2) 150 4) 250 25. Given the unbalanced equation: Al(OH)3 + H2SO4 → Al2(SO4)3 + H2O What is the coefficient in front of the H2O when the equation is completely balanced using the smallest whole number coefficients? 1) 6 3) 3 2) 2 4) 4 26. Given the equation: X + Cl2 - C2H5Cl + HCl 27. 28. 29. 30. 31. 32. 33. 34. Which molecule is represented by X? 1) C2H4 2) C2H6 3) C3H6 4) C3H8 Given the reaction: 2CH3OH(l) + 3O2(g) →2CO2(g) + 4H2O(g) How many liters of O2(g) are needed to produce exactly 200 liters of CO2(g)? 1) 100 L 3) 300 L 2) 200 L 4) 400 L Given the reaction: CH4 + 2O2 → CO2 + 2H2O What amount of oxygen is needed to completely react with 1 mole of CH4? 1) 2 moles 3) 2 grams 2) 2 atoms 4) 2 molecules Given the reaction: C3H8(g) + 5O2(g) →3CO2(g) + 4H2O(g) What is the total volume of H2O(g) formed when 8.00 liters of C3H8(g) is completely oxidized? 1) 32.0 L 3) 8.00 L 2) 22.4 L 4) 4.00 L Given the reaction: 2C2H6 + 7O2 → 4CO2 + 6H2O What is the total number of moles of CO2 produced when one mole of C2H6 is completely reacted? 1) 1 3) 3 2) 2 4) 4 Given the balanced equation: NaOH + HCl → NaCl + H2O What is the total number of grams of H2O produced when 116 grams of the product, NaCl, is formed? 1) 9.0 g 3) 36 g 2) 18 g 4) 54 g Given the reaction: 4Al + 3O2 → 2Al2O3 How many moles of Al2O3 will be formed when 27 grams of Al reacts completely with O2? 1) 1.0 3) 0.50 2) 2.0 4) 4.0 When the equation __H2O2 → __H2O + __O2 is completely balanced, the sum of all the coefficients will be 1) 5 3) 3 2) 8 4) 4 Given the reaction: Ca + 2H2O → Ca(OH)2 + H2 How many moles of H2O are needed to exactly react with 2.0 moles of Ca? 1) 1.0 3) 0.50 2) 2.0 4) 4.0 35. Given the unbalanced equation: __C3H8(g) + __O2(g) → __H2O(g) + __CO2(g) When the equation is completely balanced using smallest whole numbers, the coefficient of O2 is 1) 5 3) 3 2) 2 4) 10 36. Given the reaction: Ca + 2H2O → Ca(OH)2 + H2 How many moles of H2O are needed to react completely with 2.0 moles of Ca? 1) 1.0 mole 3) 0.50 mole 2) 2.0 moles 4) 4.0 moles 37. Given the equation: H2(g) + Cl2(g) → 2HCl(g) What is the total number of moles of HCl(g) produced when 3 moles of H2(g) is completely consumed? 1) 5 moles 3) 3 moles 2) 2 moles 4) 6 moles 38. Given the balanced equation: Fe(s) + CuSO4(aq) - FeSO4(aq) + Cu(s) What total mass of iron is necessary to produce 1.00 mole of copper? 1) 26.0 g 3) 112 g 2) 55.8 g 4) 192 g 39. Given the equation: __FeCl2 +__Na2CO3 → __FeCO3 +__NaCl When the equation is correctly balanced using the smallest whole numbers, the coefficient of NaCl is 1) 6 3) 3 2) 2 4) 4 40. If an equation is balanced properly, both sides of the equation must have the same number of 1) atoms 3) molecules 2) coefficients 4) moles of molecules 41. Which equation is correctly balanced? 1) Zn + Ag+ →Zn2+ + Ag 2) Cu + Au3+ →Cu2+ + Au 3) Al + Sn2+ →Al3+ + Sn 4) Ca + Mg2+ →Ca2+ + Mg 42. Given the reaction: Ca(s) + 2H2O(l) →Ca(OH)2(aq) + H2(g) When 40.1 grams of Ca(s) reacts completely with the water, what is the total volume, at STP, of H2(g) produced? 1) 1.00 L 3) 22.4 L 2) 2.00 L 4) 44.8 L 43. Given the reaction: N2 + 3H2 → 2NH3 How many grams of ammonia are produced when 1.0 mole of nitrogen reacts? 1) 8.5 3) 34 2) 17 4) 68 44. Given the equation: 2 C2H2(g) + 5 O2(g) - 4 CO2(g) + 2 H2O(g) How many moles of oxygen are required to react completely with 1.0 mole of C2H2? 1) 2.5 3) 5.0 2) 2.0 4) 10 45. When the equation __ Cu + __H2SO4 → __CuSO4 + __H2O + __SO2 is correctly balanced, what is the coefficient of CuSO4? 1) 1 2) 2 46. Given the reaction: 3) 3 4) 4 2H2(g) + O2(g) → 2H2O(l) 47. 48. 49. 50. 51. What is the total number of liters of O2(g) at STP needed to produce 6.0 × 1023 molecules of H2O(l)? 1) 11.2 L 3) 33.6 L 2) 22.4 L 4) 44.8 L When the equation __NH3 + __O2 → __HNO3 + __ H2O is completely balanced using smallest whole numbers, the coefficient of O2 would be 1) 1 3) 3 2) 2 4) 4 Given the balanced equation: 2Na + S → Na2S What is the total number of moles of S that reacted when 4.0 moles of Na were completely consumed? 1) 1.0 mole 3) 0.5 mole 2) 2.0 moles 4) 4.0 moles According to the reaction H2 + Cl2 → 2HCl, the production of 2.0 moles of HCl would require 70. grams of Cl2 and 1) 1.0 g of H2 2) 2.0 g of H2 3) 3.0 g of H2 4) 4.0 g of H2 When the equation __H2 + __N2 → __NH3 is completely balanced using smallest whole numbers, the sum of all the coefficients will be 1) 6 3) 3 2) 7 4) 12 Given the unbalanced equation: __Fe2O3 + __CO - __Fe + __CO2 When the equation is correctly balanced using the smallest whole-number coefficients, what is the coefficient of CO? 1) 1 3) 3 2) 2 4) 4 52. Given the reaction: 2KClO3(s) → 2KCl(s) + 3O2(g) What is the total number of moles of KClO3(s) needed to produce 6 moles of O2(g)? 1) 1 3) 3 2) 2 4) 4 53. Given the reaction 2KClO3→ 2KCl + 3O2 What is the total number of moles of KCl produced when 1.50 moles of KClO3 is decomposed? 1) 1.50 3) 3.00 2) 4.50 4) 0.75 54. Given the unbalanced equation: __N2(g) + __H2(g) →_NH3(g) When the equation is balanced using smallest wholenumber coefficients, the ratio of moles of hydrogen consumed to moles of ammonia produced is 1) 1:3 3) 2:3 2) 3:1 4) 3:2 55. Given the reaction: 2SO2(g) + O2(g) → 2SO3(g) What is the total number of liters of SO3 produced when 32.0 liters of SO2 reacts completely? (All measurements are made at STP.) 1) 11.2 L 3) 40.0 L 2) 32.0 L 4) 44.8 L 56. When the equation __ C2H4 + __ O2 → __ CO2 + __ H2O is balanced using smallest whole numbers, what is the coefficient of the O2? 1) 1 3) 3 2) 2 4) 4 57. Given the equation: 6CO2(g) + 6H2O(l) → C6H12O6(s) + 6O2(g) What is the minimum number of liters of CO2(g), measured at STP, needed to produce 32.0 grams of oxygen? 1) 264 L 3) 192 L 2) 32.0 L 4) 22.4 L 58. Given the reaction: N2(g) + 3 H2(g) ↔ 2 NH3(g) What is the mole-to-mole ratio between nitrogen gas and hydrogen gas? 1) 1:2 3) 2:2 2) 1:3 4) 2:3 59. Given the reaction: 2C2H6 + 7O2 → 4CO2 + 6H2O What is the total number of moles of CO2 produced by the complete combustion of 5.0 moles of C2H6? 1) 1.0 mole 3) 5.0 moles 2) 2.0 moles 4) 10. moles 60. Given the reaction: 4NH3 + 5O2 → 4NO + 6H2O What is the maximum number of moles of H2O that can be produced when 2.0 moles of NH3 are completely reacted? 1) 1.0 3) 3.0 2) 2.0 4) 6.0 Reference Tables Answer Key 1. 3 30. 2 2. 2 31. 3 3. 1 32. 3 4. 3 33. 1 5. 3 34. 4 6. 2 35. 1 7. 3 36. 4 8. 2 37. 4 9. 4 38. 2 10. 1 39. 2 11. 2 40. 1 12. 2 41. 4 13. 2 42. 3 14. 2 43. 3 15. 2 44. 1 16. 4 45. 1 17. 2 46. 1 18. 3 47. 2 19. 1 48. 2 20. 4 49. 2 21. 3 50. 1 22. 3 51. 3 23. 2 52. 4 24. 1 53. 1 25. 1 54. 4 26. 2 55. 2 27. 3 56. 3 28. 1 57. 4 29. 1 58. 2 Answer Key 59. 4 60. 3