MOLAR MASS Molar mass of a substance = mass in grams of one mole of the substance. A compound’s molar mass is NUMERICALLY equal to its formula mass. Formula.

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MOLAR MASS Molar mass of a substance = mass in grams of one mole of the substance. A compound’s molar mass is NUMERICALLY equal to its formula mass. Formula mass is expressed in atomic mass units (amu) found on the periodic table. Ex. 2 mol H x 1.01 g H = 2.02 g H 1 mol H 1 mol O x g O = g O 1 mol O molar mass H 2 O = g/mol Formula mass H 2 O = amu Molar mass H 2 O = g/mol

Molar Mass Summary Mathematically, formula mass = molar mass. Units are different. It is acceptable to round average atomic mass to 2 decimal places for most applications. Multiply each atom present by its mass and add all masses together to find molar mass.

NaCl 1 Na = g/mol +1 Cl = g/mol g/mol MgCl 2 1 Mg = g/mol +2 Cl = g/mol(2 x = 70.90) g/mol 11 Na Atomic # Symbol Avg. atomic mass 17 Cl O Mg 24.31

NaClO 3 1 Na = g/mol 1 Cl = g/mol (3 x 16 = 48) +3 O = g/mol g/mol Mg(ClO 2 ) 2 1 Mg = g/mol (2 x = 70.90) +2 Cl = g/mol (4 x = 64.0) +4 O = g/mol g/mol 11 Na Atomic # Symbol Avg. atomic mass 17 Cl O Mg 24.31