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Molar Mass & Conversions

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The Mole mole (mol)- SI Unit for the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12. A unit of counting, like the dozen.

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Avogadro’s Number Avogadro’s Number - the number of particles in exactly one mole of a pure substance. 1 mole = 6.0221415 X 10 23 1 mol = 6.022 x 10 23 Amedeo Avogadro

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Atomic Mass atomic mass - the mass of one mole of an atom Atomic mass is expressed in atomic mass units (amu) or (u) or g/mol. Can be found on the periodic table. All atomic masses are based on the atomic mass of carbon-12 being 12 amu.

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Molar Mass molar mass - the mass of one mole of a pure substance. Molar mass is written in units of amu or g/mol.

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Atomic mass vs. Molar mass atomic mass - the mass of one mole of an atom. molar mass - the mass of one mole of a pure substance.

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Atomic Mass vs. Molar Mass ExampleAtomic MassMolar Mass Na Ag C O 22.99 g/mol 107.87 g/mol 12.01 g/mol 16.00 g/mol

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Molar Mass of Compounds CompoundMolar Mass H2OH2O C 6 H 12 O 6 NaCl Cl 2 (NH 4 ) 3 PO 4 CuSO 4 ·5H 2 O 18.02 g/mol 180.18 g/mol 58.44 g/mol 70.90 g/mol 149.12 g/mol 249.72 g/mol

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Introduction to Molar Conversions AmountMass 1 mol O 2 ½ mol O 2 2 mol O 2 3 mol O 2 32.00 g 16.00 g 64.00 g 96.00 g

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Grams to Moles Converting grams to moles: divide by molar mass. 1. How many moles of Ca are in 5.00g of Ca? 2. How many moles of H 2 O are in 36.0g of H 2 O? 3. How many moles of AgNO 3 are in 124.5g of AgNO 3 ?

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Moles to Grams Converting from moles to grams: multiply by molar mass. 1.What is the mass in grams of 2.25 moles of Fe? 2.What is the mass in grams of 0.896 moles of BaCl 2 ?

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Types of Particles Atoms – C, Cu, He Molecules – O 2, C 12 H 22 O 11, CO 2 (all nonmetals in the formula) Formula units – NaCl, CaCl 2, Mg(NO 3 ) 2 (includes a metal in the formula)

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Particles to Moles Converting particles to moles: divide by Avogadro's Number. 1.How many moles of Pb are in 1.50 X 10 25 atoms of Pb? 2.How many moles of CO 2 are in 6.78 X 10 21 molecules of CO 2 ? 2.49 x 10 1 moles Pb 1.13 x 10 -2 moles CO 2

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Moles to Particles Converting moles to atoms: multiply by Avogadro's Number. 1.How many molecules of NO are in 0.87 moles of NO? 2.How many formula units of NaI are in 2.50 moles of NaI? 5.2 x 10 23 molecules NO 1.51 x 10 24 formula units NaI

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Grams to Moles to Particles Example: How many molecules of N 2 are in 57.1g of N 2 ?

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Particles to Moles to Grams Example: How many grams of NaF are in 7.89 X 10 24 formula units of NaF?

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Atoms to Moles to Grams Tough Example: How many total atoms are in 235 g of CO 2 ? 9.64 x 10 24 total atoms

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The Mole Bridge

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