t he mole and avogadro s number n.
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T he Mole and Avogadro’s Number. Mole ( n ): the amount of substance 6.02x10 23 particles (atoms or molecules) of a substance The same number of particles as atoms in 12 grams of carbon-12. Review. How many atoms are there in 1.2 moles of oxygen?

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Presentation Transcript
slide2

Mole (n): the amount of substance

  • 6.02x1023 particles (atoms or molecules) of a substance
  • The same number of particles as atoms in 12 grams of carbon-12
review
Review
  • How many atoms are there in 1.2 moles of oxygen?
  • Calculate the number of moles of nitrogen equal to 3.45x1015 atoms of nitrogen.
counting atoms
Counting Atoms
  • CO
  • CO2
  • Fe(NO3)3
  • C6H12O6
  • potassium carbonate
slide5

How many molecules in 5 moles of water?

  • How many hydrogen atoms in 5 moles of water?
  • How many atoms in 5 moles of water?
slide6

1. How many chloride ions are there in zinc chloride?

2. A sample of zinc chloride contains 3.1x1019 molecules.

a. How many moles is this?

b. How many zinc ions?

c. How many chloride ions?

slide9

Atomic mass (A): the mass of an atom of an element relative to (compared to) other elements (g/mol)

slide10

Ionic: formula unit

  • Molecular (covalent): molecule
slide11

Formula mass: sum of the atomic masses of the atoms in the compound’s formula (IONIC) (g/mol)

  • Molecular mass: sum of the atomic masses of all the atoms in one molecule (COVALENT) (g/mol)
slide12

Molar mass (M): the mass of one mole of any substance (g/mol)

    • atoms, molecules, ions, etc.
slide13

Ionic

Formula Mass

Molar

Mass

Covalent

Molecular

Mass

slide15

Calculate the mass of 1.98 moles of iron (II) nitrate.

  • How many molecules are there in 1.00 grams of iron (II) nitrate?
  • Calculate the mass of one molecule of iron (II) nitrate.