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Unformatted text preview: Question 12: (5 points) o Exactly two moles of substance Y in the liquid state are placed in an empty 0.5 L- container at 242 C and the container is sealed and equilibrated. Given the thermodynamic data provided in the data section for substance Y, determine the equilibrium pressure of the vapor phase at this temperature. 4 4 3 4 4 3 a) 1.34x10 Pa b) 6.10x10 Pa c) 8.20x10 Pa d) 9.41x10 Pa e) 2.56x10 Pa f) 1.10x10 Pa Show your calculations and state your assumptions! Question 13: (5 points) The state function whose change at constant temperature and pressure is defined as the maximum non- expansion work is equal to: a) U- TS b) U c) U+pV- TS d) PV e) U+pV f) S Justify your reasoning. Question 14: (5 points) The temperature dependence of the vapor pressure of the liquid phase of a substance can be approximated by the relation ln(P) = 14.73822 – 7109.27 / T and that of the vapor pressure of the solid phase of that substance by ln(P) = 15.91423 – 7384.69 / T. In both cases, T is given in kelvin and P in kPa. Estimate the standard enthalpy of fusion for this substance. Show your calculations. a) 40. kJ/mol b) 34 kJ/mol c) 61 kJ/mol d) 29 kJ/mol e) 8.8 kJ/mol f) 8.6 kJ/mol g) 2.3 kJ/mol h) 5.7 kJ/mol i) 6.1 kJ/mol...
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This note was uploaded on 01/26/2014 for the course CHEM 3615 taught by Professor Aresker during the Spring '07 term at Virginia Tech.

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