PAST EXAMS - EXAM 1 - SPRING 07 - WORKED SOLUTIONS

PAST EXAMS - EXAM 1 - SPRING 07 - WORKED SOLUTIONS - I I I...

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I I I ABCOE ABCDE I 1 @@@@a 41 00000 2000.0 UOOOOO 3000.0 a@@@@@ 40000. [email protected]@ [email protected]@O eOO.00 4600000 7000.0 [email protected]@ 00.00 400000 m.0000 n 00000 a@@@,@ YO0000 13.000@ 500000 140.000 5#00000 [email protected] RiOO000 16.0000 ~00000 1700.00 5700000 18.000@ 5800000 190.000 BOOOOO TEsTFotwCOOE: @.@@@ i 10.000 41OOOOO 2.0000 rpO0000 4300000 40000. 4400000 5000m0 nOOOO0 6000.0 4600000 7.0000 WOO@@@ ~0.000 r00OOO s00a90 4800000 1o.0000 5000000 11 00.00 12.0000 130000.0 [email protected] 150@@00 160.000 170@@0. 1800.00 1900#00 abO@@.@ a 0.000 ' 2200.00 23000.0 24.0000 a600000 nOOO0O 2000000
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CHM2045 Exam 1 Form Code A Solutions Spring 2007 (Correct multiple choice answer numbers given in parentheses, with solutions following) 1. (5) 1 mm = 1x10 -3 m and 1 mm 3 = (1x10 -3 m) 3 = 10 -9 m 3 2. (4) 1 dm = 10 cm, so order should be mm < cm < dm 3. (4) (0.184 mol Na 2 SO 3 /L) x (0.001L) x (2 mol Na + / 1 mol Na 2 SO 3 ) x (6.022x10 23 ions/mol -1 ) = 2.2x10 20 Na + ions 4. (5) Cu(HCO 2 ) 2 •4H 2 O has a molecular mass of 225.65 u, and oxygen makes up 128 u of that, so 128u / 225.65u x 100% = 56.73 % 5. (3) 3X + 4Z X 3 Z 4 (5.00 g Z) / (135.0 g/mol Z) = 0.037 mol Z [(2.00 g X)] / [(0.037 mol Z) (3 mol X / 4 mol Z)] = 72 g/mol X Therefore, atomic mass of X = 72 u 6. (3) Atomic mass of Br = 79.90 u (average of masses of all Br isotopes) So (0.5054 · 78.918u) + ((1-0.5054) · x) = 79.90u 39.885 + 0.4946x = 79.90 x = 80.90u 7. (4) oxygen gas is O 2 and iron(III) oxide = Fe 2 O 3 , so 4 Fe + 3 O 2 Æ 2 Fe 2 O 3 8. (2) Of the four ions mixed, only Ba 2+
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This note was uploaded on 05/31/2008 for the course CHM 2045 taught by Professor Mitchell during the Spring '07 term at University of Florida.

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PAST EXAMS - EXAM 1 - SPRING 07 - WORKED SOLUTIONS - I I I...

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