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chem6b practice problem-hess's law

# chem6b practice problem-hess's law - 1 Using the following...

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Name: _________________________ Date: Friday, April 18, 2008 Chem 6B, Winter 2008 TA: Angie Koo Hess’ Law Practice Problem This problem was originally intended to be the first question on the quiz, but it was too difficult for the purposes of a quiz. However, I strongly suggest that you try this problem and understand it, as it is a good indicator of your FULL understanding of this type of problem with some twists to it. Possibly relevant constants: 8.314 J/mol*K; 0.08206 L*atm/K*mol
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Unformatted text preview: 1) Using the following data, calculate the standard enthalpy of formation of CaC 2(s) at 25 ° C (14 points) : CaC 2(s) + 2H 2 O (l) Ca(OH) 2(s) + C 2 H 2 (g) ∆H ° rxn = -127.9 kJ/mol Ca (s) + ½ O 2(g) CaO (s) ∆H ° rxn = -635.1 kJ/mol CaO (s) + H 2 O (l) Ca(OH) 2(s) ∆H ° rxn = -65.2 kJ/mol The standard enthalpies of combustion of graphite and C 2 H 2(g) are also given to be -393.51 kJ/mol and -1299.58 kJ/mol, respectively....
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