Masses & Particles (College Board AP® Chemistry)
Study Guide
Written by: Fallon
Reviewed by: Stewart Hird
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
The mass of one carbon atom versus one mole of carbon atoms
Examiner Tips and Tricks
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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