Chem5F07PracticeFinal

Chem5F07PracticeFinal - Chemistry 5 Final Exam Practice...

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Chemistry 5 Fall 2007 Final Exam Practice Problems Extra Cumulative Problems: 14.86, 15.100, 15.119, 16.51, 12.76, 13.58, 13.65, 15.84, 17.82, 17.49, 17.94 1. Your neighbor has found a suspicious substance in his attic and enlists your help in determining what it is. Preliminary analysis shows that it only consists of C, H and O. A. You place 2.00 g of this compound and excess oxygen in a 0.500 L sealed container. After complete combustion you remove the remaining O 2(g) ; condensing the water vapor gives 0.817 g of H 2 O (l) and you find 3.50 atm of CO 2(g) at 40°C remaining in the container. What is the empirical formula of the compound? B. Later you dissolve 2.00 g of this compound in 25.0 mL of water and find that the solution is acidic, indicating that the substance is a weak acid. Assuming it is a monoprotic acid (which you later find out is true), you titrate it with a 0.500 M NaOH solution and find that it takes 22.7 mL to reach the equivalence point. What is the molar mass of the compound? C. What is the molecular formula of the compound? D. Later you find that the K a for this compound is 8.00 x 10 -5 . In the titration where you dissolve 2.00 g of this compound in 25.0 mL of water and titrate it with a 0.500 M NaOH solution, determine the pH after you have added 10.0 mL of the NaOH solution . (Note, if you can not determine the concentration of the weak acid in part B, use 0.50 M.) 2 . Sulfuryl chloride, SO 2 Cl 2 , is a colorless liquid that boils at 69 °C. Above this temperature it decomposes into sulfur dioxide and chlorine gas:
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Chem5F07PracticeFinal - Chemistry 5 Final Exam Practice...

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