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Questions from an exam in chemistry, covering topics such as equilibrium constants, cell reactions, and standard cell potentials. Students are required to calculate thermodynamic properties, identify half-reactions, and determine cell potentials and equilibrium constants.
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Fall 1999 1) The equilibrium constant, Kp, for the hydrogenation of pyridine to piperidine, C 5 H 5 N(g) + 3H 2 (g) = C 5 H 11 N(g) in the temperature range of 140 0 C to 260 0 C can be expressed by the equation ln Kp = -46.699 + (24320/T). Calculate H^0 , G^0 , and S^0 at 200 0 C. [P^0 = 101325 Pa]
2) Consider the cell Hg(l) Hg 2 SO 4 (s) FeSO 4 (aq, a=0.01) Fe(s) a) Write the cell reaction. b) Calculate the cell potential, the equilibrium constant for the cell reaction, and G^0 at 25 0 C. 3) Use the following information to determine the half-reactions associated with the cell denoted below at 298.15 K. Also calculate the cell potential and the Ksp (based on activities) of AgI at this temperature. (15 points) Ag AgNO 3 (0.01M) NaI (0.01M) AgI Ag AgI(s) + e-^ = Ag(s) + I-(aq) E^0 = -0.15 V Ag+(aq) + e-^ = Ag(s) E^0 = +0.80 V
5) What total pressure is required to achieve a 85.0% conversion of PCl 5 to products according to the following equilibrium at 600 K if Kp is 52.9 at this temperature? (15 points) PCl 5 (g) = PCl 3 (g) + Cl 2 (g) a) If H for the reaction above is 88.0 kJ/mol, what is the value of Kp at 300 K? b) BONUS If the total pressure of this system were increased, how would the equilibrium be affected? Explain your answer. (5 points)
6) Use Figure 1 to answer the following questions. (10 points) a) What is the boiling point of a solution prepared by mixing 25.0 g of C 2 H 5 OH and 375.0 g of C 6 H 6? b) What is composition of the vapor above the solution in a) just as it begins to boil?
