Students should be able to...

• Define: average atomic mass, mole
• Find the average atomic mass of an element (laboratory)
• Convert grams to moles, moles to grams, atoms to moles, moles to atoms, atoms to grams, grams to atoms for an element or compound
• Know the value and definition of Avogadro’s number.
• Calculate the average atomic mass of an element when given natural abundance of each isotope
• Calculate percent composition of a compound
• Find the percent yield (laboratory)

  Practice Problems

  Find the molecular weight of each compound.

  1. BaI₂
  2. AgC₂H₃O₂
  3. C₂H₆
  4. Na₃PO₄
  5. Fe(OH)₃

  Convert.

6. 0.4 moles of Sn to atoms

7. 32 g of K₂O to molecules

8. 3.7 g of H₂ to moles

9. 800 g of CaCl₂ to moles

10. 0.75 moles of H₂O to grams

11. 9.0 g of Cl₂ to atoms

12. 0.5 moles of KNO₃ to grams

13. 2.7 X 1022 molecules H₂O to moles

14. 3.1 X 1024 atoms Kr to grams

15. 50 atoms Na to moles