T he Mole and Avogadro’s Number

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# T he Mole and Avogadro’s Number - PowerPoint PPT Presentation

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

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
• 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
• CO
• CO2
• Fe(NO3)3
• C6H12O6
• potassium carbonate

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?

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?

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

Ionic: formula unit

• Molecular (covalent): molecule

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)
• atoms, molecules, ions, etc.

Ionic

Formula Mass

Molar

Mass

Covalent

Molecular

Mass

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.