121quiz2practiceans

# 121quiz2practiceans - equation below How many grams of NO(g...

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Practice Quiz 2 Dr. Heyns Chemistry 121 Week of Autumn Quarter 2006 October 9, 2006 Time: 20 min Points: 30 Name of student:__________________________________ Name of TA:______________________________________ 1. (4pts) Balance the following equations: 2 NH 4 Cl + Ba(OH) 2 2 NH 3 + BaCl 2 + 2 H 2 O 2 C 5 H 12 O + 15 O 2 10 CO 2 + 12 H 2 O 2. (5 pts) The number of C atoms in 0.350 mol sucrose, C 6 H 12 O 6 , is equal to: (Avogadro’s number is 6.022 x 10 23 ) a) 1.26 x 10 24 b) 6.022 x 10 23 c) 2.1077 x 10 23 d) 1.56 x 10 22 e) 2.35 x 10 24

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3. (7 pts) A compound was analyzed in the lab and found to contain 68.8% C, 4.92% H and 26.3% O. Determine the empirical formula of the compound. C 7 H 6 O 2 4. (7 pts) Gaseous hydrogen chloride reacts with aqueous nitric acid according to the
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Unformatted text preview: equation below. How many grams of NO (g) are produced by reaction of 18.4 g of HCl (g) with excess HNO 3 (aq)? 6 HCl (g) + 2 HNO 3 (aq) → 4 H 2 O(g) + 2 NO (g) + 3 Cl 2 (g) 5.04 g 5. (7 pts) Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s) + H 2 O → Ca(OH) 2 (s) In a particular experiment, a 5.00 g sample of CaO is reacted with excess of water and 6.11 g of Ca(OH) 2 is recovered. What is the percent yield in the experiment? a) 122 b) 1.22 c) 7.19 d) 92.4 e) 81.9...
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## This note was uploaded on 05/14/2009 for the course CHEM 121 taught by Professor Wyzlouzil during the Fall '07 term at Ohio State.

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121quiz2practiceans - equation below How many grams of NO(g...

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