sample exam questions - CHM 2132 Final Exam 1/8 CHM 2132...

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CHM 2132 Final Exam 1/8 CHM 2132 final exam sample questions (8 points) For the following reaction at 298 K, the partial pressures for the reactants are 500 Pa for methane, 400 Pa for chlorine, 250 Pa for tetrachloromethane, and 800 Pa for hydrogen. Will the reaction under these conditions tend to generate more products? ( ) ( ) ( ) ( ) g H 2 g CCl g Cl 2 g CH 2 4 2 4 + + (10 points) Qualify the following statements as true or false. T/F a) The total energy of the universe is always increasing. b) A gas that expands spontaneously and irreversibly is performing work. c) Δ H for any phase transition is always positive. d) The vapour pressure of a liquid solution is directly proportional to the concentration of its non-volatile solute. e) The boiling temperature of water can be raised by adding a small amount of sugar. f) For a given reaction A Æ B. The more favourable the reaction is energetically, the larger the value of the equilibrium constant for the reaction as written. g) At equilibrium, the chemical potential of a pure solid is lower than the chemical potential of the surrounding solution. h) An electrolytic cell is defined by a spontaneous overall chemical reaction. i) The rate constant of a first order reaction is independent of the concentration of reactants. j) Each line in the phase diagram of a pure substance indicates the coexistence of two phases. (7 points) Find the change in entropy for 3.50 mol of water when it is heated from 298.15 K to 573 K at constant pressure. (T fusion =273.15K, T vap =373.15K).
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CHM 2132 Final Exam 2/8 (8 points) Write the half cell and full cell reactions, and calculate the potential for the following cell ( ) ( ) ( ) ( ) ( ) s Ag s AgBr aq HBr g H s Pt 2 if the hydrogen pressure is equal to 700 Torr and if the HBr is at 0.600 mol/kg with a mean ionic activity coefficient equal to 0.757. The standard-state reduction potential for AgBr(s)/Ag(s) is +0.070 V. Do not forget that the standard molality (b°) is equal to 1 mol/kg and the standard pressure (p°) is equal to 760 Torr (1 bar). Assume room temperature (298 K) and give your answer in units of volts. (5 points) The values for heat of vaporization (at 373.15 K) and of fusion for water (at 273.15 K) are given below (for this question we will assume that the heat of vaporization is independent of temperature). The vapour pressure of ice at 273.15 K is 611 Pa. Calculate the sublimation pressure of ice at 232.89 K, assuming that all enthalpy changes are constant over this range of temperatures.
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