C__Documents and Settings_Nancy.NANCY-LAPTOP_Local Settings_Application Data_Mozilla_Firefox_Profile

C__Documents and Settings_Nancy.NANCY-LAPTOP_Local Settings_Application Data_Mozilla_Firefox_Profile

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villanueva (jcv746) – 19D Thermodynamics: First Law – scott – (APCHEM) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. 001 10.0 points In which o± the ±ollowing reactions would Δ H rxn NOT be equal to Δ H f ±or the product? 1. 2 Fe(s) + 3 2 O 2 (g) Fe 2 O 3 (s) 2. C(graphite) + 2 H 2 (g) CH 4 (g) 3. H 2 (g) + 1 2 O 2 (g) H 2 O(g) 4. CO(g) + 1 2 O 2 (g) CO 2 (g) 002 10.0 points The combustion reaction ±or benzoic acid C 6 H 5 CO 2 H(s) + 15 2 O 2 (g) 7 CO 2 (g) + 3 H 2 O( ) has Δ H 0 = - 3226 . 7 kJ/mole. Use Hess’s Law to calculate Δ H 0 f ±or benzoic acid. 1. - 385 . 2 kJ/mol 2. - 698 . 1 kJ/mol 3. - 1609 kJ/mol 4. - 237 . 4 kJ/mol 5. No choice is correct. 6. - 348 . 6 kJ/mol 003 10.0 points The bond enthalpy in NO is 632 kJ / mol and that o± each N O bond in NO 2 is 469 kJ / mol. Explain the di²erence in bond enthalpies be- tween the two molecules. 1.
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This note was uploaded on 10/29/2011 for the course CHE 101 taught by Professor Scoot during the Spring '11 term at Davidson.

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C__Documents and Settings_Nancy.NANCY-LAPTOP_Local Settings_Application Data_Mozilla_Firefox_Profile

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