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MOLAR MASS The molar mass is the mass, in grams, of one mole (6.02 1023 particles) of an element (ion), a covalent molecule or a formula unit. molar mass (MM) gram atomic mass (gam) molecular weight (MW) gram molecular mass (gmm) formula mass (FM) gram formula mass (gfm) formula weight (FW)

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MASS of one MOLE Gram atomic mass (gam): the atomic mass (the mass in one mole of a substance) of an element expressed in grams. Gram molecular mass (gmm): the atomic mass of one mole of a molecular compound. Gram formula mass (gfm): the sum of the atomic masses of the atoms that are in the formula of a compound.

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gam, gfm, gmm examples: Problem: Give the gram atomic mass of hydrogen. Solution: H = 1H = 1(1.01) = 1.01 g/mol Problem: Give the gram molecular mass of hydrogen. Solution: H2 = 2H = 2(1.01) = 2.02 g/mol Problem: Find the gram formula mass for H2SO4. Solution: H2SO4 = 2H + 1S + 4O = 2(1.01) (16.00) = g/mol

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**Molar Mass … a.k.a. Molecular Weight (MW)**

molar mass = mass of 1 mole of substance Molar mass can be determined by adding up the atomic masses from the periodic table (atomic mass goes to 2 decimal places).

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**MW Example 1: = 1C + 4H = 12.01 + 4(1.01) = 16.05 g CH4/mol CH4**

Find the MW of CH4. = 1C + 4H = (1.01) = g CH4/mol CH4

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**MW Example 2: =Mg + 2O + 2H =24.31 + 2(16.00) + 2(1.01)**

Find the MW of Mg(OH)2. =Mg + 2O + 2H = (16.00) + 2(1.01) =58.33 g Mg(OH)2 /mol Mg(OH)2

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**MW Example 3: Find the MW of MgSO4∙7H2O. =Mg + S + 4O + 7(H2O)**

= (16.00) + 7( ) = g MgSO4∙7H2O /mol MgSO4∙7H2O

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Calculations: Use Mole Map to help calculate

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**Mole Mass Calculations**

1 mole = molar mass (MW) in grams Mass MOLE

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Mass Example 1: How many grams are in 7.20 moles of dinitrogen trioxide? dinitrogen trioxide = N2O3 MW of N2O3 = 2N + 3O = 2(14.01) + 3(16.00) = g/mol 1 mole = g N2O3

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**MW of Fe2O3 = 2Fe + 3O = 2(55.85) + 3(16.00) = 159.70 g/mol**

Mass Example 2: Find the number of moles in 92.2 g of iron(III) oxide. iron(III) oxide = Fe2O3 MW of Fe2O3 = 2Fe + 3O = 2(55.85) + 3(16.00) = g/mol 1 mole = g Fe2O3

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**Make sure you write out all work and include all units!!**

Practice Worksheet Do #1-10 on Mole and Mass WS Make sure you write out all work and include all units!!

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CHEMICAL QUANTITIES All Roads Lead to the Mole Chemical Quantities Measuring doughnuts: o1 dozen = 12 doughnuts (count) o1 dozen = 500 g doughnuts (mass)

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