Practice Final

# Boiling solvent point k bp o cm h 2 o 1000 o c 0512

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Boiling Solvent Point K bp o C/m H 2 O 100.0 o C 0.512 CS 2 46.3 o C 2.40 (8) 3. The formation of phosgene, COCl 2 , was studied by sealing 0.96 atm of carbon monoxide and 1.02 atm of Cl 2 in a reactor at 682 K making the total pressure 1.98 atm. When the system reached equilibrium, the total pressure was

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Page 2 measured as 1.22 atm. Calculate K p for the reaction CO(g) + Cl 2 (g) ! " ! # ! ! COCl 2 (g) (10) 4. If you dissolve 4.25 g benzoic acid, C 6 H 5 CO 2 H, in enough water to make 125. mL solution, what is the pH of your solution? See reference page for data. (10) 5. The pH of a 3.84 M solution of KCN is 11.98. Calculate K b for CN . (25) Part III: Multiple Choice 5 questions @ 5 points each (5) 1. What is the pH of a 0.0044 M Ca(OH) 2 solution? Caution!!! a) 2.05 b) 2.35 c) 11.64 d) 11.94 (5) 2. The reaction 2 A + 2 B 2 ---> A 2 B 4 is believed to occur in three steps: Step 1: 2 A + B 2 ! " ! # ! ! 2 AB fast, equilibrium Step 2: 2 AB + B 2 ---> 2 AB 2 slow Step 3: 2 AB 2 ---> A 2 B 4 fast What is rate law is derived from this mechanism? a) rate = k [A] 1 [B 2 ] 2 b) rate = k [A] 1/2 [B 2 ] c) rate = k [A] 2 [B 2 ] 1 d) rate = k [A] 2 [B 2 ] 2 (5) 3. The density of a 14.0% (by mass) solution of MgBr 2 is 1.09 g/cm 3 . What is the molarity of the solution ? (5) 4. Nitrosyl bromide decomposes at some constant temperature to reach equilibrium according to the equation: 2 NOBr(g) ! " ! # ! ! 2 NO(g) + Br 2 (g) What changes would be observed when more Br 2 is added to the system at equilibrium? a) shift to the right, [NO] decreases, K c remains the same b) shift to the right, [NO] increases, K c increases c) shift to the left, [NO] decreases, K c remains the same d) shift to the left, [NO] decreases, K c decreases (5) 5. The equilibrium constant, K c , at a given temperature for the reaction below is 0.80. A ! " ! # ! ! 2 B + 3 C A chemist introduces 3.0 mol A, 2.0 mol B, and 1.0 mol C into an empty 1.0 L flask . When equilibrium is achieved, the concentration of A a) is more than 3.0 M b) is less than 3.0 M c) is exactly 3.0 M
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• Spring '10
• MCMILLS
• Mole, pH, Sodium chloride, Freezing-point depression

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