Ex-3-3530-S10

Ex-3-3530-S10 - CHEM 3530 - Exam 3 April 2, 2010 (57) PART...

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April 2, 2010 (57) PART I. MULTIPLE CHOICE (Circle the ONE correct answer) For #1 - #2: When 45 grams of glucose (M=180) is added to 120 grams of water (M=18), the density of the solution is 1.25 g/mL. 1. The Molarity of the above solution is (A) 1.5 Molar (B) 1.9 Molar (C) 2.6 Molar (D) 2.1 Molar 2. The molality of the above solution is (A) 1.5 molal (B) 1.9 molal (C) 2.6 molal (D) 2.1 molal 3. How many grams of sucrose (M=342) are required to prepare 2.5 L of a 0.40 Molar sucrose solution? (A) 342 grams (B) 171 grams (C) 137 grams (D) 55 grams 4. The vapor pressure of water (M=18) at 50 o C is 90 torr. When 90 grams of glucose (M=180) is dissolved in 90 grams of water (M=18), the vapor pressure of the solution at 50 o C is approximately: (A) 8 torr (B) 76 torr (C) 82 torr (D) 99 torr 5. The weak electrolyte, AB 3 (M=80) dissociates according to the equilibrium: AB 3 = A 3+ + 3B - . When 40 grams of AB 3 are dissolved in 150 grams of H 2 O (K f = 1.9 o C), AB 3 is 70% dissociated. The freezing point of the solution is: (A) -19.6 o C (B) -15.2 o C (C) -10.8 o C (D) 6.3 o C 6. When 41 grams of the strong electrolyte, Ca(NO 3 ) 2 (M=164) is dissolved in 250 grams of water (K f =1.9 o C/m), the freezing point of the solution is (A) -17.1 o C (B) +5.7 o C (C) -1.9 o C (D) -5.7 o C 7. The osmotic pressure of an aqueous solution of sucrose is 6.40 bar at 30 o C. How many moles of sucrose are contained in 250 mL of this solution? (A) 3.8x10 -3 mol (B) 0.064 mol (C) 0.25 mol (D) 6.4x10 -4 mol 8. The normal boiling point of pure CCl 4 (l) is 77 o C and the boiling point elevation constant is 5.0 o C/m. When 5 grams of an unknown compound is placed in 100 grams of CCl 4 , the boiling point of the solution is 84.5
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This note was uploaded on 04/12/2011 for the course CHEM 3520 taught by Professor Staff during the Fall '08 term at North Texas.

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Ex-3-3530-S10 - CHEM 3530 - Exam 3 April 2, 2010 (57) PART...

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