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Fall 2009 Exam 1 Practice i Zumdahl Chapters 3,4,12,13_ no answer key

# Fall 2009 Exam 1 Practice i Zumdahl Chapters 3,4,12,13_ no answer key

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Practice Exam 1i (Zumdahl Chapters 3,4,12,13) Page 1 1. When the equation NH 3 + O 2 NO + H 2 O is balanced with the smallest set of integers, the sum of the coefficients is A) 4 B) 12 C) 14 D) 19 E) 24 2. Which of the following contains the greatest percentage of nitrogen by mass? A) NH 3 B) NO 2 C) N 2 O D) C 6 H 4 N 3 O 6 E) HCN 3. Vitamin C contains the elements C, H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has been found to be about 180. The molecular formula for vitamin C is: A) C 2 H 3 O 2 B) C 3 H 4 O 3 C) C 4 H 6 O 4 D) C 6 H 8 O 6 4. How many grams of Ca(NO 3 ) 2 can be produced by reacting excess HNO 3 with 7.40 g of Ca(OH) 2 ? A) 10.2 g B) 16.4 g C) 32.8 g D) 8.22 g E) 7.40 g

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Practice Exam 1i (Zumdahl Chapters 3,4,12,13) Page 2 5. Consider the following reaction: 4NH 3 (g) + 7O 2 (g) 4NO 2 (g) + 6H 2 O(l) Consider an experiment in which you react ammonia and oxygen. At the end of the experiment, you find that you produced 27.0 g of water, and 8.52 g of ammonia is left over. Calculate the initial mass of ammonia. Assume the reaction went to completion. A) 17.0 g
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Fall 2009 Exam 1 Practice i Zumdahl Chapters 3,4,12,13_ no answer key

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