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Unformatted text preview: CHEMISTRY 201X: Homework #9 Due : Monday, December 3, 2007 Equilibrium Applications (1) (6 pts) Snow and ice sublime spontaneously when the partial pressure of water vapor is below the equilibrium vapor pressure of ice. At 0 C the vapor pressure of ice is 0.0060 atm (the triple point of water). Taking the enthalpy of sublimation of ice to be 50.0 kJ/mol, calculate the partial pressure of water vapor below which ice will sublime spontaneously at 15 C. (2) (14 pts) At 1200 K in the presence of solid carbon, an equilibrium mixture of CO(g) and CO 2 (g) (called producer gas) contains 98.3 mole percent CO and 1.69 mole percent CO 2 (g) when the total pressure is 1 atm. The reaction is C O 2 (g) + C(graphite) ZZX YZZ 2 CO(g) (a) (2 pts) Calculate p (CO) and p (CO 2 ) (in atm). (b) (2 pts) Calculate the equilibrium constant K p at 1200 K from these data. (c) (2 pts) Calculate G (in kJ) from these data. (d) (4 pts) Use thermodynamic data to calculate G (in kJ) and K p at 1200 K. Compare with your results in parts (b) and (c)....
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