1.2+Formulas

Learning Goals (3 hours)


 * Define the terms relative atomic mass (Ar) and relative molecular mass (Mr).
 * Calculate the mass of one mole of a species from its formula.
 * Solve problems involving the relationship between the amount of substance in moles, mass and molar mass.
 * Distinguish between the terms empirical formula and molecular formula.
 * Determine the empirical formula from the percentage composition or from other experimental data.
 * Determine the molecular formula when given both the empirical formula and experimental data.

Khan Academy Lecture: Molecular and Empirical Formulas View website media type="file" key="molecular formula.mp4" width="300" height="300" Khan Academy Lecture: Formula from Mass Composition View website media type="file" key="mass composition.mp4"