# Test 1 - Version 003 – Exam 1 302 – sutcliffe –(51060...

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Unformatted text preview: Version 003 – Exam 1 302 – sutcliffe – (51060) 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The equilibrium constant for the reaction 2 SO 2 (g) + O 2 (g) ⇀ ↽ 2 SO 3 (g) has the value K = 4 × 10 24 at 298 K. Find the value of K for the reaction SO 2 (g) + 1 2 O 2 (g) ⇀ ↽ SO 3 (g) at the same temperature. 1. 1 . 73 × 10 2 2. 2 × 10 12 correct 3. 2 . 64 × 10 6 4. 1 . 58 × 10 5 5. 8 . 23 × 10 8 6. 3 . 95 × 10 10 Explanation: For the first equation 2 SO 2 (g) + O 2 (g) ⇀ ↽ 2 SO 3 (g) K 1 = P 2 SO 3 P 2 SO 2 · P O 2 = 4 × 10 24 . For the second reaction SO 2 (g) + 1 2 O 2 (g) ⇀ ↽ SO 3 (g) K = P SO 3 P SO 2 · P 1 / 2 O 2 = radicalbig K 1 = radicalbig 4 × 10 24 = 2 × 10 12 002 10.0 points Which of the following is likely to be LEAST soluble in water? 1. C 6 H 6 (benzene). correct 2. C 6 H 12 O 6 (glucose). 3. CH 3 OH (methanol). 4. HCHO (formaldehyde). Explanation: 003 10.0 points Many biological cells are killed if they are placed in pure water because 1. if nothing can pass through the cell wall, the greater pressure inside than outside causes the cell to burst open. 2. if nothing can pass through the cell wall, the greater pressure outside than inside causes the cell to collapse. 3. vital cell constituents dissolved in the cell fluid pass through the cell wall causing the cells to die. 4. the water in the cells passes out through the cell wall causing the cell to shrivel and die. 5. more water passes in through the cell wall than passes out so the cells swell and burst. correct Explanation: More solvent molecules pass through the semi-permeable cell membrance into the cell where the solvent concentration is low than in the other direction. This process coninues until pressure on both sides of the membrane is equal or until the cell from the large volume of excess water that enters. 004 10.0 points Useful conversions: 760 torr = 1atm = 760 mm Hg. 1 inch = 2.54cm. Version 003 – Exam 1 302 – sutcliffe – (51060) 2 Weather trivia: The lowest ever recorded sea-level atmospheric pressure was 25.69 inches of Hg inside of typhoon Tip, on Octo- ber 12, 1979. If you had been unlucky enough to be inside of it, at sea level, on that date, what would have been the boiling point of wa- ter? The enthalpy of vaporization of water is 40.7 kJ/mol. 1. 104 . 39 ◦ C 2. 101 . 929 ◦ C 3. 99 . 69 ◦ C 4. 100 . 13 ◦ C 5. 95 . 7131 ◦ C correct Explanation: T 1 = 373 . 15 K P 1 = 760 torr P 2 = 25 . 69 in . Hg Δ H ◦ vap = 40.7 kJ/mol = 40700 kJ / mol P 2 = (25 . 69 in . Hg) 2 . 54 cm 1 in 10 mm 1 cm × 1 torr 1 mm Hg = 652 . 526 torr At ANY liquid’s normal boiling point, the vapor pressure is 1.0 atm....
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## This note was uploaded on 02/06/2012 for the course CHEM 302 taught by Professor Mccord during the Fall '10 term at University of Texas.

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Test 1 - Version 003 – Exam 1 302 – sutcliffe –(51060...

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