AP®ChemistryCollege BoardStudy GuidesUnit 1: Atomic Structure & PropertiesMoles & Molar MassMasses & Particles

Masses & Particles (College Board AP® Chemistry)

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Masses & Particles

  • The average mass of an individual atom, molecule, or formula unit is reported in atomic mass units (amu)

  • Molar mass (M) is the mass of one mole of a substance

  • Molar mass has the same numerical value as the corresponding atomic mass but is reported in units of g/mol 

Species

Zn

SO2

Ca(C2H3O2)2

Molar mass (g/mol)

65.38

64.06

158.168

 Comparing average atomic mass and molar mass

mass-of-carbon-atom-versus-mole-of-carbon-atoms

The mass of one carbon atom versus one mole of carbon atoms

Examiner Tip

To solve multiple choice questions involving molar mass more quickly, use rounded atomic masses and memorize the atomic mass of common elements such as H, O, N, C, S, and Cl. However, be sure to use the atomic mass as written on the provided periodic table for all free response questions.

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    Fallon

    Author: Fallon

    Expertise: Chemistry Content Creator

    Fallon obtained a double major in chemistry and secondary education, and after graduating she taught Chemistry and Organic Chemistry for 7 years. Fallon’s passion for creating engaging classroom materials led her to pursue a career in content development. For over 3 years, Fallon has created videos, review materials, and practice questions for AP Chemistry, IGCSE, and other international exam boards.