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The Mole

The Mole. Dimensional Analysis Review. How many seconds are in 5.0 hours?. Dimensional Analysis Review. Calculate the number of inches in 26 yards. Stoichiometry. _______________ is just a long word for changing units in chemistry Just remember to ALWAYS start with your ___________ !

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The Mole

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  1. The Mole

  2. Dimensional Analysis Review • How many seconds are in 5.0 hours?

  3. Dimensional Analysis Review • Calculate the number of inches in 26 yards

  4. Stoichiometry • _______________ is just a long word for changing units in chemistry • Just remember to ALWAYS start with your ___________! • If you can do Dimensional Analysis, you can do stoichiometry

  5. Steps • Start with your ___________ • Use ___________ and cross out until you get what you wanted • Check ___________

  6. The Mole • Chemists need a convenient method for counting accurately the number of atoms, molecules, or formula units in a sample of a substance. • The ___________ (mol) is the SI base unit used to measure the ___________ of a substance.

  7. The Mole • A mole of anything contains ___________ representative particles. • A representative particle is any kind of particle such as atoms, molecules, formula units, electrons, or ions. • 6.02 x 1023 is called ___________ number

  8. Conversion Factor #1

  9. Representative Particles • Anything - ___________ • Elements – ___________ • Covalent Compounds – ___________ • Ionic Compounds – ___________ • Ions - ___________

  10. Mole – Representative Particle Calculations • Calculate the number of atoms in 3.50 moles of copper

  11. Another Example • Calculate the number of molecules in 2.6 moles of H2O

  12. Another Example • Calculate the number of formula units in 5.23 moles of NaCl

  13. Mole – Representative Particle Calculations • How many moles of MgO are in 9.72 x 10 23 molecules of MgO?

  14. Another Example • How many moles are in 4.50 x 1024 atoms of Zinc?

  15. Mass & the Mole • The mass in grams of 1 mole of a substance is called the ___________ • It can also be called: • To get the molecular weight you just add up all of the masses of all of the elements in a compound

  16. Molecular Weight • Calculate the molecular weight of the following: • Ca • Na

  17. Molecular Weight • Calculate the molecular weight of the following: • MgO • NaCl • H2O • Fe2O3

  18. Conversion Factor # 2 1 mole Molecular weight (g) The molecular mass comes from the periodic table!

  19. Mole – Mass Calculations • What is the mass of 4.21 moles of iron (III) oxide?

  20. Another Example • Calculate the mass of 1.630 moles of Na

  21. Mole – Mass Calculations • How many moles of Ca(OH)2 are in 325 grams?

  22. Another Example • How many moles are in 62.17 g of sodium chloride?

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