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The ChemCollective >> Stoichiometry Tutorials>> Dimensional Analysis

Stoichiometry Tutorials: Part 3 - Dimensional Analysis / Stoichiometric Conversions (from a complete OLI stoichiometry course)

Dimensional analysis allows us to change the units used to express a value. For instance, it allows us to convert between volume expressed in liters and volume expressed in gallons. The following video gives a brief overview of dimensional analysis, including conversion between the amount of a substance expressed in "number of molecules" and the amount of a substance expressed in "moles of molecules."

Text version of this movie.

Remember that it is always a good idea to write both the unit and substance associated with any chemical quantity; e.g., 1.3 g H2O or 5.4 x 1023 molecules H2 instead of 1.3 g or 5.4 x 1023 molecules. This will help you keep track of your quantities correctly and prevent you from making mistakes in your computations.

Conversion table for problems below.

1 lb = 16 oz = 453.6 g
1 kg = 1000 g = 2.20462 lb
1 gal = 3.7854 L
1 cm3 = 1mL

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   Page Last Updated: 02.15.2011