Percentage Composition

This video shows step by step solutions to a few different percent composition problems.

You can view the transcript for “Percentage Composition” here (opens in new window).

Molecular and Empirical Formulas

Introduction to molecular and empirical formulas. The presenter shows both types of formulas for a variety of molecules. He also reviews the process of calculating molecular mass.

You can view the transcript for “Molecular and Empirical Formulas” here (opens in new window).

Formula from Mass Composition

How to figure out the empirical formula from a molecule’s mass composition.

You can view the transcript for “Formula from Mass Composition” here (opens in new window).

Molecular and Empirical Formulas from Percent Composition

Presenter works through a multi-step problem to calculate molecular and empirical formulas from percent composition.

[NOTE: at 8:58 the presenter accidentally writes 6 instead of 2 (he says aloud “2 oxygens”), it is corrected it later]

You can view the transcript for “Molecular and Empirical Forumlas from Percent Composition” here (opens in new window).