 # Using Molar Mass as a Conversion Factor.  A molar mass is the mass in grams of one mole of a substance.  One mole of any substance contains Avogadro’s.

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Using Molar Mass as a Conversion Factor

 A molar mass is the mass in grams of one mole of a substance.  One mole of any substance contains Avogadro’s number of particles.  6.022 x 10 23 particles.  Calculated by adding together the masses of all of the individual atoms in a chemical formula.  Units are grams per mole (g/mol).  Example – KClO 3  K = 39.10g x 1 atom= 39.10g  Cl =35.45g x 1 atom= 35.45g  O =16.00g x 3 atoms = 48.00g  39.10 + 35.45 + 48.00 = 122.55 g KClO 3

 Complete practice problems.  Solutions:  H 2 SO 4 = 98.09 g  Ca(NO 3 ) 2 = 164.10 g  PO 4 3- = 94.97 g  MgCl 2 = 95.21 g  Na 2 SO 3 = 126.06 g  HClO 3 = 84.46 g  MnO 4 - = 118.94 g  C 2 H 6 O = 46.08 g

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