key2 - CHEM 1211K Test II MULTIPLE CHOICE. (3 points each,...

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Unformatted text preview: CHEM 1211K Test II MULTIPLE CHOICE. (3 points each, place answer on the answer sheet) 1) The formula weight of ammonium sulfate ((NH 4 ) 2 SO 4 ) is __________ amu. A) 100 B) 118 C) 116 D) 132 2) Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s) + H 2 O(l) Ca(OH) 2 (s) In a particular experiment, a 0.0892mol sample of CaO is reacted with excess water and 0.0825mol of Ca(OH) 2 is recovered. What is the percent yield in this experiment? A) 122 B) 1.22 C) 7.19 D) 92.4 3) The combustion of ammonia in the presence of excess oxygen yields NO 2 and H 2 O: 4 NH 3 (g) + 7 O 2 4 NO 2 (g) + 6 H 2 O(g) The combustion of 1.69mol of ammonia consumes __________ mol of oxygen. A) 2.97 B) 1.69 C) 3.38 D) 0.478 4) The combustion of propane (C 3 H 8 ) in the presence of excess oxygen yields CO 2 and H 2 O: C 3 H 8 (g) + 5O 2 (g) 3CO 2 (g) + 4H 2 O(g) When 2.5 mol of O 2 are consumed in their reaction, __________ mol of CO 2 are produced. A) 1.5 B) 3.0 C) 5.0 D) 6.0 5) Water can be formed from the stoichiometric reaction of hydrogen with oxygen: 2H 2 (g) + O 2 (g) 2H 2 O(g) A complete reaction of 5.0 g of O 2 with excess hydrogen produces __________ g of H 2 O. A) 5.6 B) 2.8 C) 2.3 x 10 2 D) 0.31 6) Calculate the percentage by mass of nitrogen in PtCl 2 (NH 3 ) 2 . A) 4.67% B) 9.34% C) 9.90% D) 4.95% 7) The molecular formula of aspartame, the generic name of NutraSweet, is C 14 H 18 N 2 O 5 . The molar mass of aspartame is __________ g....
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key2 - CHEM 1211K Test II MULTIPLE CHOICE. (3 points each,...

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