CH 301 Quiz 3 - Wright, Jacqueline – Quiz 3 – Due: Mar...

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Unformatted text preview: Wright, Jacqueline – Quiz 3 – Due: Mar 30 2007, 11:00 pm – Inst: Sara Sutcliffe This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This is for some extra practice with moles, etc. NOTE: You will need to write your own equation for Q2, so read the Q carefully, all products and reactants are listed! 001 (part 1 of 1) 10 points What numbers are needed to balance the following chemical equation? ? C10 H22 + ? O2 → ? CO2 + ? H2 O 1. 2; 42; 20; 22 2. 2; 31; 20; 22 3. 1; 16; 10; 22 4. 1; 21; 10; 11 002 (part 1 of 1) 10 points Acetylene (C2 H2 ) burns in pure oxygen with a very hot flame. The products of this reaction are carbon dioxide and water. How much oxygen is required to react with 52.0 g of acetylene? 1. 52.0 g 7. 50% 2. 240.0 g 3. 32.0 g 4. 160.0 g 003 (part 1 of 1) 10 points One mole of F2 gas 1. contains 1.20 × 1024 F atoms. 2. weighs 6.02 × 1023 grams. 3. contains 6.02 × 1023 F atoms. 4. weighs 19.0 grams. 1 004 (part 1 of 1) 10 points One mole of H2 contains (the same number of, more, fewer) atoms than/as one mole of He? 1. more 2. the same 3. fewer 005 (part 1 of 1) 10 points Avogadro’s number is really big. If you had 6.02 × 1023 dollars, and could spend it at $1 billion (109 ) per second for the rest of your life (let’s say 80 years), approximately what percentage of your original money would you have left when you die? 1. 75% 2. 10% 3. 95% 4. 0% 5. 100% 6. 90% ...
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