Feb 16-solutions

# Feb 16-solutions - chauhan(mmc2762 Feb 16 sparks(51150 1 3...

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chauhan (mmc2762) – Feb 16 – sparks – (51150) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. Your last homework had review stoichiom- etry and limiting reactant problems. This assignment includes those topics and extends them by including percent yield in the prob- lems. I± you haven’t be±ore studied percent yield, see my discussion board posting and the discussion o± it starting on page 77 in your text. For next class, preview sections 14.1 and 13.13. 001 10.0 points Calculate the ±ormal charge on N in the molecule NH 3 . 1. 3 2. 4 3. 2 4. 0 correct 5. 1 Explanation: The Lewis structure is N b H 0 H 0 H 0 0 002 10.0 points Consider the ±ollowing sets A, B, and C A 1 ) b N C N b b b b b b b b B 2 - A 2 ) b N C N b b b b b b b b B 2 - B 1 ) O As O b b b b b b O b b b b b b O b b b b b b b b b b b b 3 - C 1 ) I O O O O b b b b b b b b b b b b b b b b b b - B 2 ) O As O b b b b b b O b b b b O b b b b b b b b b b b b 3 - C 2 ) I O O O O b b b b b b b b b b b b b b b b b b b b - B 3 ) O As O b b b b O b b b b O b b b b b b b b 3 - C 3 ) I O O O O b b b b b b b b b b b b b b b b b b b b b b b b - o± ions. Determine the ±ormal charge on each atom and identi±y the structure o± lowest energy ±or each set A, B, and C. 1. A 2 , B 3 , C 2 2. A 2 , B 2 , C 2 3. A 1 , B 2 , C 3 4. A 1 , B 1 , C 1 5. A 2 , B 3 , C 3 6. A 1 , B 2 , C 1 correct Explanation: A 1 ) b N C N b b b b b b b b - 1 0 - 1 B 2 - A 2 ) b N C N b b b b b b b b 0 0 - 2 B 2 - B 1 ) O As O b b b b b b O b b b b b b O b b b b b b b b b b b b - 1 - 1 - 1 - 1 +1 3 - C 1 ) I O O O O b b b b b b b b b b b b b b b b b b 0 0 0 - 1 0 - B 2 ) O As O b b b b b b O b b b b O b b b b b b b b b b b b - 1 - 1 0 - 1 0 3 - C 2 ) I O O O O b b b b b b b b b b b b b b b b b b b b 0 0 - 1 - 1 +1 -

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chauhan (mmc2762) – Feb 16 – sparks – (51150) 2 B 3 ) O As O b b b b O b b b b O b b b b b b b b 0 0 0 0 - 3 3 - C 3 ) I O O O O b b b b b b b b b b b b b b b b b b b b b b b b - 1 - 1 - 1 - 1 +3 - 003 10.0 points Which of the following is the correct Lewis formula for boron trichloride (BCl 3 )? 1.
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Feb 16-solutions - chauhan(mmc2762 Feb 16 sparks(51150 1 3...

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