Moles to Atoms Conversion Answers: 1. 2 x 1024 atoms Fe 2. 2.7 x 1024 atoms Ag 3. 5.4 x 1024 atoms He 4. 2.88 x 1025 atoms Ti 5. 3.7 x 1024 atoms C 6. 2.81 x 1024 atoms N 7. 7.77 x 1024 atoms H 8. 5.37 x 1026 atoms B 9. 4.55 x 1026 atoms N 10. 5 x 1019 atoms C 11. 2.7 x 1019 atoms Fe 12. 1.4 x 1051 atoms C 13. 5 x 1040 atoms H 14. 3.4 x 1017 atoms C

Atoms to Moles Conversion Answers: 1. 1.1 mol Fe 2. 0.60 mol Ag 3. 0.38 mol He 4. 1.64 mol Ti 5. 30 mol C 6. 1.2 x 108 mol N 7. 6.5 x 10-7 mol H 8. 3.5 x 10-14 mol B 9. 1.6 x 1013 mol N 10. 1.3 x 10-15 mol C 11. 7.5 x 105 mol Fe 12. 1.5 x 10-5 mol C 13. 2 x 10-7 mol H 14. 9.5 x 10-17 mol C

Chapter 10.1 Practice Problems Converting Between # of Particles/Moles 1. Calculate the number of molecules in 15.7 mol carbon dioxide. 2. Calculate the number of molecules in 0.0544 mol H2O. 3. Calculate the number of moles in 9.22 x 1023 atoms iron. 4. Calculate the number of moles of sucrose in a sample that contains 2.05 x 1022 sucrose molecules. 5. A student uses 0.0850 mol copper sulfate to carry out a reaction. If the reaction uses up 0.0832 mol copper sulfate, how many formula units are left unreacted?

Practice Problems Answers 1. 9.45 x 1024 molecules CO2 2. 3.27 x 1022 molecules H2O 3. 1.53 moles Fe 4. 0.0341 or 3.41 x 10-2 moles sucrose 5. 1.08 x 1021 formula units copper sulfate

10.2 Mass and the Mole Objectives: Relate the mass of an atom to a mass of a mole of atoms. Convert between the number of moles and the mass of an element.

Mass and the Mole (Cont.) Molar mass – the amount in grams of one mole of a substance. Equal to the atomic mass of single elements or the formula mass of compounds. Units used are always g/mol (grams per mole). Calculate the molar mass for: Group 2 elements Group 18 elements

Calculating Molar Mass (Cont.) Calculating molar mass for molecules/formula units: You must determine how many atoms of each element you have, first. Then calculate the molar mass. Use E/A/M/ chart E = Element A = Amount Atoms M = Molar Mass  = Total

Mass and the Mole (Cont.) When converting between Mass, Amount, and Number of Particles, convert from: (Avo’s #) (Molar Mass) # Particles → Amount → Mass (Molar Mass) (Avo’s #) Mass → Amount → # Particles

Calculating Molar Mass (Cont.) Use E/A/M/ chart to first calculate the number of atoms of each element in the formula then calculate the molar mass of the formulas: CaSO3 K2Cr2O7 Al(NO3)3 Al2(SO4)3

Do Problems 15-18, Pages 328-329

Do Problems 19-21, Page 331