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Quiz%205%20Fall%202010

Quiz%205%20Fall%202010 - Version 001 Quiz 5 sparks(50990...

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Version 001 – Quiz 5 – sparks – (50990) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Msci110007 001 1.0points 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 Mlib041127 002 1.0points 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 = nRT n = P V RT = (1 . 08 atm)(1 . 00 L) ( 0 . 082 L · atm mol · K ) (329 K) = 0 . 0400326 mol Use Avogardo’s number (1 mol = 6.022 × 10 23 molec) to find the number of molecules: 0 . 0400326 mol = 6 . 022 × 10 23 molec / mol × 0 . 0400326 mol = 2 .
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