Homework 3 - September 23, 2009 homework 3 Name_ MULTIPLE...

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September 23, 2009 homework 3 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) When a hydrocarbon burns in air, what component of air reacts? A) carbon dioxide B) argon C) water D) nitrogen E) oxygen 2) 2) Which of the following are combustion reactions? 1) CH 4 (g) + O 2 (g) ± CO 2 (g) + H 2 O (l) 2) CaO (s) + CO 2 (g) ± CaCO 3 (s) 3) PbCO 3 (s) ± PbO (s) + CO 2 (g) 4) CH 3 OH (l) + O 2 (g) ± CO 2 (g) + H 2 O (l) A) 1, 3, and 4 B) 1 and 4 C) 1, 2, 3, and 4 D) 2, 3, and 4 E) 3 and 4 3) 3) The molecular weight of the acetic acid (CH 3 CO 2 H) is __________ amu. A) 32 B) 48 C) 44 D) 60 4) 4) How many carbon atoms are there in 52.06 g of carbon dioxide? A) 1.424 × 10 24 B) 5.206 × 10 24 C) 8.648 × 10 - 23 D) 7.122 × 10 23 E) 3.134 × 10 25 5) 5) The formula of nitrobenzene is C 6 H 5 NO 2 . The molecular weight of this compound is __________ amu. A) 109.10 B) 43.03 C) 107.11 D) 3.06 E) 123.11 1
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6) 6) Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N 2 (g) ± 2Li 3 N (s) How many moles of N 2 are needed to react with 0.500 mol of lithium? A) 1.50 B) 3.00 C) 0.500 D) 0.167 E) 0.0833 7) 7) The formula weight of silver chromate (Ag 2 CrO 4 ) is __________ amu. A) 339.86 B) 223.87 C) 159.87 D) 331.73 E) 175.87 8) 8) Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN 3 (s) ± 2Na (s) + 3N 2 (g) How many moles of N 2 are produced by the decomposition of 2.88 mol of sodium azide? A) 1.44 B) 1.92 C) 0.960 D) 8.64 E) 4.32 9) 9) The mass % of C in methane (CH 4 ) is __________. A) 7.743 B) 25.13 C) 74.87 D) 133.6 E) 92.26 10) 10) How many moles of pyridine (C 5 H 5 N) are contained in 3.13 g of pyridine? A) 0.319 B) 0.0396 C) 0.00404 D) 4.04 × 10 3 E) 25.3 11) 11) How many molecules of CH 4 are in 48.2 g of this compound? A) 4.00 B) 1.81 × 10 24 C) 3.00 D) 2.90 × 10 25 E) 5.00 × 10 24 12) 12) Calculate the percentage by mass of chlorine in PtCl 2 (NH 3 ) 2 . A) 12.53 B) 23.63 C) 11.82 D) 25.05 E) 18.09 13) 13) How many atoms of nitrogen are in 10 g of NH 4 NO 3 ? A) 2 B) 1.5 × 10 23 C) 3.5 D) 1.8 E) 3.0 × 10 23 14) 14) The molecular weight of the ethanol (C 2 H 5 OH) is __________ amu. A) 41 B) 92 C) 30 D) 46 E) 34 2
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15) 15) The mass % of F in the binary compound KrF 2 is __________. A) 18.48 B) 45.38 C) 31.20 D) 68.80 E) 81.52 16) 16) A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be __________. A) N
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This note was uploaded on 10/18/2009 for the course FSDQ gdgdg taught by Professor Inkla during the Spring '09 term at École Normale Supérieure.

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Homework 3 - September 23, 2009 homework 3 Name_ MULTIPLE...

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