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Understanding Molecular Mass and Mole Conversions in Chemistry

Learn about calculating molecular mass and mole conversions, determining atom and molecule weights, and solving factor-label problems in this comprehensive guide. Practice with a Mole Worksheet to master the concepts.

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Understanding Molecular Mass and Mole Conversions in Chemistry

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  1. Chapter 8 Mole Conversions Part 2

  2. 3.2: Molecular Mass/Weight Formula Mass/Weight • The formula of an Acetylsalicylic Acid (Aspirin) molecule is C9H8O4 • Acetylsalicylic Acid (Aspirin) has molar mass of 180.159 g/mol • How many hydrogen atoms are contained in a 0.372 g tablet?

  3. 0.372g C9H8O4

  4. 0.372g C9H8O4 mol 180.159 g

  5. 0.372g C9H8O4 mol 6.02 x 1023 molecules 180.159 g mol

  6. 0.372g C9H8O4 mol 6.02 x 1023 molecules 8 H atoms 180.159 g mol molecule

  7. 0.372g C9H8O4 mol 6.02 x 1023 molecules 8 H atoms 180.159 g mol molecule = 9.94 x 1021 H atoms

  8. What is the mass in grams of one atom of carbon?

  9. What is the mass in grams of one atom of carbon? 12.0 g/mol

  10. What is the mass in grams of one atom of carbon? 12.0 g mol

  11. What is the mass in grams of one atom of carbon? 12.0 g mol = 1.99 x 10-23 g/atom mol 6.02 x 1023 atoms

  12. What is the mass in grams of one molecule of water?

  13. What is the mass in grams of one molecule of water? 18.0 g mol

  14. What is the mass in grams of one molecule of water? 18.0 g mol = 2.99 x 10-23 g/molecule mol 6.02 x 1023 molecules

  15. Information for Upcoming Mole Quiz • How does a mole relate to particles and mass? (example: One mole of H2O is 6.02 x 1023 H2O molecules and has a mass of 18g). • Be able to use this information in factor-label problems. • Know how to determine the number of atoms in a molecule. Be able to use this information in factor-label problems. • Be able to determine the number of grams/molecule. • Identify the diatomic gases. • Do metric conversions.

  16. Homework • Mole Worksheet (#1-20) • Notice that answers are provided for this worksheet in your notebook.

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