Chapter 7 Study Guide

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Chapter 7 Study Guide (Mass Stoichiometry) This study guide lists the definitions and concepts that you need to learn from the lecture PowerPoint slides. This Study Guide is not turned in for a grade but should be completed and used to study for the exams. In addition to this Study Guide, you should also complete and study the Homework and Unit Review. Definitions: formula mass mole Avogadro’s number molar mass (MM) percent composition stoichiometry theoretical yield actual yield Concepts: 1. What is the SI abbreviation for mole? 2. What is the formula used to calculate the percent composition of an element in a compound? 3. Mole conversions involve only one substance. For mole conversions use this diagram: To convert between moles and grams , what conversion factor do we use? To convert between moles and particles (atoms), which conversion factor do we use? To convert between grams and particles (atoms), which conversion factors do we use? (There are 2 conversion factors needed).
4. Mole to mole conversions involve two substances from a chemical reaction. The amount of one substance (A) is given in moles and the amount of another substance (B) is calculated in moles. For mole A to mole B conversions use this diagram: From where do we get the mole ratio of A and B? 5. Gram to gram conversions involve two substances from a chemical reaction. The amount of one substance (A) is given in grams and the amount of another substance (B) is calculated in grams. For mass stoichiometry use this diagram: What are the three conversion factors required for a mass stoichiometry problem? What method do we use to set up the calculation? 6. What is the formula for calculating percent yield ? 7. List three reasons the actual yield might be lower than the theoretical yield.
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