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chem6bquiz#1 - Name Date Friday Chem 6B Winter 2008 TA...

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Name: _________________________ Date: Friday, April 18, 2008 Chem 6B, Winter 2008 TA: Angie Koo Quiz #1 40 points Show all work and calculations used to arrive at your answer. Adequate and CLEAR work with units and the correct amount of significant figures must be shown in order to receive ANY credit. Answers must be offset by placing a box around the final answer. Possibly relevant constants: 8.314 J/mol*K; 0.08206 L*atm/K*mol 1) Using the following data, calculate the enthalpy of reaction for the equation CaC 2(g) + H 2 O (l) C 2 H 2(g) + Ca (s) + ½ O 2(g) . Ca(OH) 2(s) + C 2 H 2 (g) CaC 2(s) + 2H 2 O (l) 1) ∆H ° rxn = +127.9 kJ/mol 2Ca (s) + O 2(g) 2CaO (s) 2) ∆H ° rxn = -1270.2 kJ/mol Ca(OH) 2(s) CaO (s) + H 2 O (l) 3) ∆H ° rxn = +65.2 kJ/mol CaC 2(s) + 2H 2 O (l) Ca(OH) 2(s) + C 2 H 2 (g) ∆H ° rxn = -127.9 kJ/mol (-∆H 1 ) CaO (s) Ca + O 2 ∆H ° rxn = +635.1 kJ/mol (-½∆H 2 ) Ca(OH) 2(s) CaO (s) + H 2 O (l) ∆H ° rxn = +65.2 kJ/mol (∆H 3 ) CaC 2(g) + H 2 O (l) C 2 H 2(g) + Ca (s) + ½ O 2(g) ∆H ° rxn = +572.4 kJ/mol
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2) An ideal, diatomic substance has the following thermochemical data (12 points) : T f = 227.5K; T B = 526.1K; ∆H fus = 3.37 kJ/mol;
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