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Chem 162 Spring 03, Test 1

Chem 162 Spring 03, Test 1 - Chemistry 162 Exam I Student...

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Chemistry 162 Exam I February 19, 2003 Student Name: _____________________ Recitation Section Number: ____ Recitation Instructor: _________________________ 01 = M3, M. Rabeony 03 = M5, R. Agarwal 04 = M5, B. Langowski 06 = W3, M. Rabeony 07 = W3, B. Langowski 08 = W5, B. Langowski 11 = F3, M. Rabeony 17 = M1, R. Agarwal 19 = M3, N. Marky 20 = M3, R. Agarwal 23 = W1, E.Tavss 25 = W3, E. Tavss 26 = W3, N. Marky 30 = TH3, N. Marky 31 = TH3, E. Tavss 33 = M6, R. Porcja 34 = M6, R. Agarwal 37 = M8, R. Porcja 38 = W6, J. Waidlich 39 = W8, J. Waidlich The exam has 25 questions for credit and an additional one to check the color of your exam booklet. Please answer all 26 questions on the OpScan sheet. There is no penalty for guessing. At the end of the 80-minute exam period, please hand in only this top sheet and your OpScan form. If you finish early, please do not disturb your fellow students. A proctor will check your picture-ID, OpScan form and signature during the exam. Exam scores and an exam curve will be posted as soon as possible. 162 EXAM I V 1 SPRING 2003 1 1. For which one of the following conversions must you know the density of the solution? A. mass percent to molality B. mass percent to molarity C. mole fraction to mass percent D. mole fraction to molality E. volume percent to proof 2. A solution is prepared from a complex inorganic salt of molar mass 317 by dissolving 4.76 g of the salt in 100 g of water. The boiling point of the solution is found to be 100.31 ºC and the boiling point elevation constant of water is 0.51 (in the usual units). This complex salt in solution A. dissociates into 2 ions B. dissociates into 4 ions C. dissociates into 3 ions D. remains an undissociated molecule E. forms dimers
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162 EXAM I V 1 SPRING 2003 2 3. The rate law for the reaction CH 3 CHO(g) CO(g) + CH 4 is 3/2 order in the reactant. At a pressure of CH 3 CHO = 0.416 atm the rate is 3.79 x 10 -3 atm/sec. The value of k is (units not shown)
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