che110c_ps2 - Chem 110C Spring 2010 Ames Problem Set 2 (due...

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Chem 110C Spring 2010 Ames 1 PS 2 Problem Set 2 (due Wed. Apr 14, 2010) 1. See below some thermodynamic data on carbon from the CRC handbook (available to you through the library as an electronic database). a. Calorimetry can be used to measure the heat of combustion ( c H) of C(g) (i.e. C(g) + O 2 (g) CO 2 (g)). Sketch a path to get from solid graphite (C(s)) to carbon vapor (C(g)) (i.e. C(s) C(g)) using the heat of combustion of C(g) (measured by calorimetry) and the heat of formation reaction for CO 2 (g) ( f H 0 ) given in the table below. b. Use the path from “1a” to back-calculate the enthalpy of combustion for C(g) using f for C(g) and f Hº for CO 2 (g). c. Calculate S 0 for converting solid graphite to carbon vapor (C(g)). d. Compare the tabulated C P for C(g) to that expected for a monatomic ideal gas (C P = 5/2*R) and comment on whether C (g) behaves as an ideal gas. 2. Use data in the table above for diamond. a. Sketch a path to get from diamond (C(s), diamond) to C(g). b. Calculate r H 0 for converting diamond(s) to C(g). c. Calculate S 0 for converting diamond(s) to C(g). 3. The data in the table above refer to a pressure of 1 bar and temperature 298.15K. Obviously
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che110c_ps2 - Chem 110C Spring 2010 Ames Problem Set 2 (due...

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