# hw7 - ctt253 Homework 7 Sparks(53535 This print-out should...

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ctt253 – Homework 7 – Sparks – (53535) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Which has more molecules: a mole of CO 2 or a mole of H 2 ? 1. They both have the same number of molecules. 2. a mole of CO 2 3. a mole of H 2 4. It depends on the pressure and tempera- ture. 002 10.0 points Avogadro’s number is really big. If you had 6.02 × 10 23 dollars, and could spend it at \$1 billion (10 9 ) 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. 0% 2. 90% 3. 50% 4. 75% 5. 10% 6. 95% 7. 100% 003 10.0 points The total number of electrons in one mole of fluorine molecules is 1. 18.99 × 6 . 0 × 10 23 . 2. 9. 3. 9 × 6 . 0 × 10 23 . 4. 18 × 6 . 0 × 10 23 . 5. 18. 004 10.0 points What is the formula weight of chromium(III) nitrite? 1. 98.0 g/mol 2. 290.0 g/mol 3. 238.0 g/mol 4. 190.0 g/mol 5. 202.0 g/mol 005 10.0 points How many grams are in 0.250 moles of C 6 H 12 O 6 ? 1. 720 g 2. 45.0 g 3. 180 g 4. 90.0 g 006 10.0 points Which of the following would contain the largest number of atoms? 1. 1.00 gram of iron (Fe) 2. All contain the same number of atoms. 3. 1.00 gram of uranium (U) 4. 1.00 gram of sulfur (S) 5. 1.00 gram of beryllium (Be) 007 10.0 points Which one has the greatest mass?

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