AP Chemistry Unit 1 Topic 3 - Elemental Composition of Pure Substances

A 1.3 question always appears on the AP exam, but only about a third of student’s pick up the points. Learn how to identify and solve any variation of these questions. I’ll walk you through the basics, develop a system for solving this problem, then walk you through examples consistent with past AP questions. 0:00 Intro 1:05 Percent Composition 4:41 Formulas 6:58 Empirical Formula 11:29 Molecular Formula 14:10 Unknown Salt 16:37 Hydrate Analysis 19:49 Combustion Analysis 22:47 Overall