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Oct 11 HW-solutions - scrushy(mgs972 Oct 11 HW sparks(50975...

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scrushy (mgs972) – Oct 11 HW – sparks – (50975) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Preview 5.3-5.5 prior to next class. Don’t forget that there are lots of extra practice problems on the webpage. 001 10.0 points Which has more molecules: a mole of CO 2 or a mole of H 2 ? 1. a mole of CO 2 2. They both have the same number of molecules. correct 3. It depends on the pressure and tempera- ture. 4. a mole of H 2 Explanation: 002 10.0 points Determine the limiting reactant if 50.0 g of NO are mixed with 30.0 g of O 2 according to the reaction 2 NO + O 2 2 NO 2 . 1. O 2 2. It is impossible to determine. 3. NO 2 4. NO correct 5. There is not a limiting reactant. Explanation: m NO = 50 . 0 g m O 2 = 30 . 0 g We recognize this as a limiting reactant problem because the amounts of more than one reactant are given. We must determine which of these would be used up first (the limiting reactant). We calculate the number of moles of each reactant
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