Sample exam 1 - 1 CHEM 1110 Fall 2009 Sample Test 1 Name E...

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CHEM 1110 Fall 2009 September 21, 2009 Sample Test 1 Name_________________________ E#________________________ You must show all work and use proper units and significant digits for full credit. 1. (15 points) Balance the following equations: a) (3 points) Mg 3 N 2 + H 2 O → Mg(OH) 2 + NH 3 b) (3 points) Fe 2 O 3 + H 2 → Fe + H 2 O c) (3 points) LiHCO 3 + H 2 SO 4 → Li 2 SO 4 + CO 2 + H 2 O d) (6 points) C 12 H 22 O 11 + O 2 → CO 2 + H 2 O 2. (15 points) A compound contains sodium, boron, and oxygen. An experimental analysis gave values of 53.976% sodium and 8.461% boron, by mass; the remainder is oxygen. What is the empirical formula of the compound? (AM of O: 15.9994 u; Na: 22.9898; B: 10.811) 1
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3. (20 points) A 6.789 g sample of a hydrocarbon, upon combustion analysis, yielded 9.883 grams of carbon dioxide. (MM of CO 2 is 44.0095; AM of C: 12.0107, H: 1.00794; N A = 6.022 x 10 23 fu/mol) a) (15 points) What is the mass percent of carbon in this compound?
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This note was uploaded on 09/22/2009 for the course MUSC 3941 taught by Professor Caton during the Spring '09 term at East Tennessee State University.

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Sample exam 1 - 1 CHEM 1110 Fall 2009 Sample Test 1 Name E...

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