test2-1 - reasoning in a few words. [2 marks each] (a)...

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Chemistry 2000 Spring 2001 Section B Test 2 Aids allowed: Calculator. In particular, periodic tables and other written or printed materials are excluded. Useful data is given at the end of this paper. Answer all questions in the booklet provided. 1. Here is a sketch of the phase diagram of xenon: 125 120 115 110 105 T ( C) P (atm) 0 0.5 1 solid liquid gas (a) What is the (approximate) minimum pressure at which solid xenon will melt rather than sublime as the temperature is increased? [2 marks] (b) What is the normal boiling point of xenon? [2 marks] (c) Which is denser, solid or liquid xenon? [2 marks] 2. The equilibrium constant for the water gas reaction C s H 2 O g CO g H 2 g is 2.6 at 1000 K. Suppose that you want to make carbon monoxide and hydrogen, i.e. you want the reaction to proceed from left to right. Give a set of initial pressures of reactants and products such that this will actually happen. [4 marks] 1
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3. Suppose that each of the following compounds is dissolved in water at room temperature. Which would be volatile (to an appreciable extent) under these conditions? Explain your
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Unformatted text preview: reasoning in a few words. [2 marks each] (a) potassium iodide (b) tartaric acid: C H CH O O OH OH OH O H (c) bromine 4. A 0.0032 mol/L aqueous solution of potassium hydroxide is prepared. What is the pH of this solution at 30 C? [4 marks] 5. Hypochlorous acid (HClO) has a p K a of 7.46 at 25 C. What is the pH of a 0.05 mol/L solution of HClO in water? [10 marks] 6. What is the vapor pressure of a solution made by mixing 50 g of ammonium sulfate into 300 g of water at 40 C? The vapor pressure of pure water at this temperature is 7373 Pa. [10 marks] 7. 2.75 atm of hydrogen gas is mixed with 1.50 atm of iodine vapor at 425 C. The two react, forming HI g . At equilibrium, the partial pressure of HI is 2.79 atm. What is the equilibrium constant for the reaction? [10 marks] Useful data Molar masses of selected elements (g/mol) H 1 0079 O 15 999 S 32 06 N 14 007 At 30 C, K w 1 47 10 14 . Thermodynamic standard states P 1atm c 1mol L 2...
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test2-1 - reasoning in a few words. [2 marks each] (a)...

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