Lesson 7.2: Molar Mass & Molecular Mass Summary

Key Concepts: Molar Mass & Molecular Mass

Core Definitions

  • Molar Mass: The mass of one mole of a substance in grams per mole (g/mol); equals atomic mass from periodic table.
  • Molecular Mass: The sum of the atomic masses of all atoms in a molecular formula.
  • Formula Mass: The sum of atomic masses for ionic compounds.
  • Calculating Molar Mass: Add up the atomic masses of each element multiplied by their subscript.
  • Example: H₂O: 2(1.01) + 16.00 = 18.02 g/mol.
  • Units: Molar mass is expressed in g/mol; molecular mass in amu (atomic mass units).
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