PAST EXAMS - EXAM 1 - SPRING 07 - WORKED SOLUTIONS

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

This preview shows pages 1–4. Sign up to view the full content.

I I I ABCOE ABCDE I 1 @@@@a 41 00000 2000.0 UOOOOO 3000.0 40000. eOO.00 4600000 7000.0 [email protected]@ 00.00 400000 m.0000 n 00000 YO0000 [email protected] 500000 140.000 5#00000 [email protected] RiOO000 16.0000 ~00000 1700.00 5700000 [email protected] 5800000 190.000 BOOOOO TEsTFotwCOOE: i 10.000 41OOOOO 2.0000 rpO0000 4300000 40000. 4400000 5000m0 nOOOO0 6000.0 4600000 7.0000 ~0.000 r00OOO s00a90 4800000 1o.0000 5000000 11 00.00 12.0000 130000.0 160.000 1800.00 1900#00 a 0.000 ' 2200.00 23000.0 24.0000 a600000 nOOO0O 2000000

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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+

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 5

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online