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| Understanding the concepts
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Check your answers |
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| 1.a.
| What is Avogadro's number? Open the Comparison of 1-Mol Samples of Various Elements Table on the Web site. Which element in the table has the lightest average atom? the heaviest average atom?
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| b.
| Another conversion factor related to the mole is molar mass. What is molar mass? How can it be used as a conversion factor (what does it convert between)? |
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| 2.
| The more problems you do regarding manipulating molar mass and Avogadro's number, the more comfortable you will become with mass to mol to atom conversions. The text has plenty of problems to choose from. Try Problems 8.90, 8.98, and 8.100. |
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| 3.
| Some compounds have the same mass percent of elements. Consider glucose, C6H12O6, and acetic acid, C2H4O2. Calculate the mass percents of carbon, hydrogen, and oxygen in these two compounds to show that they are the same. The molecular formulas of these two compounds are different, but the formulas do have something in common. What is it? |
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| 4.a.
| Empirical formulas are not the actual (molecular) formulas for a compound. Why do we spend time discussing empirical formulas if they are not real? What data do we need to determine empirical formulas? Do Question 8.56 in the text to practice relating empirical and molecular formulas.
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| b.
| For more empirical formula calculations, do Problems 8.58, 8.62, and 8.122 in the text. |
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| c.
| What data are needed to determine the molecular formula of a compound given the empirical formula? For practice determining molecular formulas, do Problems 8.78, 8.80, and 8.82 in the text. |
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| 5.
| Open Key Words on the CD and test your ability to define the important terms presented in Chapter 8. |
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| 6.
| Test your understanding of Chapter 8 by taking the ACE quizzes on the Web site. |
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