Hmwk 8 - 1. What is the limiting reactant when 31.3 g of...

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1. What is the limiting reactant when 31.3 g of manganese (II) chloride, 48.3 g of chlorine, and 25.7 g of water react to produce manganese (IV) oxide and how much hydrochloric acid is produced? A) Manganese (II) chloride is the limiting reactant and 36.3 g of hydrochloric acid is produced. B) Chlorine is the limiting reactant and 24.8 g of hydrochloric acid is produced. C) Chlorine is the limiting reactant and 6.21 g of hydrochloric acid is produced. D) Manganese (II) chloride is the limiting reactant and 8.40 g of hydrochloric acid is produced. E) Water is the limiting reactant and 52 g of hydrochloric acid is produced. 2. What is the coefficient preceding O 2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C 18 H 36 O 2 + __ O 2 → __ CO 2 + __ H 2 O A) 1 B) 8 C) 27 D) 26 E) 9 3. What is the mass of 7.80 × 10 18 carbon atoms (N A = 6.022 × 10 23 mol -1 )? A) 7.80 × 10 18 g B) 6.43 × 10 3 g C) 1.56 × 10 -4 g D) 1.30 × 10 -5 g E) 12.01 g 4. How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides) are needed to form 485 g of sulfur tetrafluoride? 3SCl 2 (l) + 4NaF(s) → SF 4 (g) + S 2 Cl 2 (l) + 4NaCl(s) A) 754 g B) 205 g C) 1940 g D) 51.3 g E) 1510 g 5. Aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent, desiccant or catalyst for organic reactions. A mixture of 82.49 g of aluminum and 117.65 g of oxygen is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete. A) Aluminum is the limiting reactant; 35.16 g of oxygen remain. B) Aluminum is the limiting reactant; 16.70 g of oxygen remain. C) Aluminum is the limiting reactant; 44.24 g of oxygen remain. D) Oxygen is the limiting reactant; 35.16 g of aluminum remain. E) Oxygen is the limiting reactant; 19.81 g of aluminum remain. 6. How many grams of Cl 2 can be prepared from the reaction of 16.0 g of MnO 2 and 30.0 g of HCl according to the following chemical equation? MnO 2 + 4HCl → MnCl 2 + Cl 2 + 2H 2 O A) 0.82 g B) 5.8 g C) 58.4 g D) 13.0 g
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E) 14.6 g 7. Aluminum oxide, Al 2 O 3 , is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al 2 O 3 . A) 1.105 mol B) 0.4660 mol C) 2.146 mol D) 0.4207 mol E) 2.377 mol 8. What is the percent sodium in sodium carbonate? A) 11.3% B) 27.7% C) 23% D) 45.3% E) 43.4% 9. Balance the following equation: B 2 O 3 (s) + HF(l) → BF 3 (g) + H 2 O(l) A) B 2 O 3 (s) + H 6 F 6 (l) → B 2 F 6 (g) + H 6 O 3 (l) B) B 2 O 3 (s) + 6HF(l) → 2BF 3 (g) + 3H 2 O(l) C) B 2 O 3 (s) + 3HF(l) → 2BF 3 (g) + 3H 2 O(l) D) B 2 O 3 (s) + 6HF(l) → 2BF 3 (g) + 6H 2 O(l) E) B 2 O 3 (s) + 2HF(l) → 2BF 3 (g) + H 2 O(l) 10. Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis it produced 1.471 g CO
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Hmwk 8 - 1. What is the limiting reactant when 31.3 g of...

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