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Unformatted text preview: Version 001 – Quiz 5 – sparks – (50990) 1 This printout should have 6 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. Msci 11 0007 001 1.0 points Jane works for the Dr. Pepper Company. She is told that she must add 12.4 grams of CO 2 to each vat of Dr. Pepper. How much volume does this amount of gas occupy at STP? 1. 0.282 L 2. 11.2 L 3. 6.3 L correct 4. 0.0126 L 5. 12.6 L Explanation: m CO 2 = 12.4 g 12 . 4 g CO 2 × mol CO 2 44 g CO 2 × 22 . 4 L CO 2 mol CO 2 = 6 . 31273 L Mlib 04 1127 002 1.0 points The number of molecules in 1.00 liter of O 2 gas at 56 ◦ C and 821 torr is 1. 32 molec. 2. 2 . 41 × 10 22 molec. correct 3. 1 . 83 × 10 25 molec. 4. 2 . 24 × 10 23 molec. 5. 4 × 10 − 2 molec. Explanation: Make sure that all of your known values are in the right units: T = 56 ◦ C + 273 = 329 K P = 821 torr 760 torr / atm = 1 . 08 atm Applying the ideal gas law equation, P V = n R T n = P V R T = (1 . 08 atm)(1...
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This note was uploaded on 11/05/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.
 Fall '07
 Fakhreddine/Lyon

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