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The Mole and Avogadro’s Number
Mole (n): the amount of substance6.02x1023 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.
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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?
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 MassStop.
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