Khan Academy Static

We'll now explore two different ways of representing what elements are in a molecule: molecular and empirical formulas. Molecular formulas actually represent the number of atoms in a molecule while empirical formulas show us the ratio of the constituents based on experiments. In order to help us connect these ideas, we'll also explore a quantity called the "mole". Just as a "dozen" represents 12 of something, a "mole" represents roughly 602,200,000,000,000,000,000,000 of something. This will help us think about mass composition of molecules.

10349_Molecular_weight_percentages.html

10350_Empirical_formula_from_mass_composition.html

10347_Empirical_molecular_and_structural_formulas.html

10351_Another_mass_composition_problem.html

10348_Molecular_mass_percentage.html