The Mole and Avogadro’s Number

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Presentation transcript:

The Mole and Avogadro’s Number

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?

Stop.

Masses of Compounds

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)

Molar mass (M): the mass of one mole of any substance (g/mol) atoms, molecules, ions, etc.

Ionic Formula Mass Molar Mass Covalent Molecular Mass

Calculating Molar Mass Stop.

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.