Chemical Quantities

Objectives

• Describe methods of measuring the amount of something
• Define Avogadro's number as it relates to a mole of a substance
• Distinguish between the atomic mass of an element and its molar mass
• Describe how the mass of a mole of a compound is calculated
• Describe how to convert the mass of a substance to the number of moles, and moles to mass
• Identify the volume of a quantity of a gas at STP

Vocabulary: mole - Avogadro's number - molar mass

Objectives

• Describe how to calculate the percent by mass of an element in a compound
• Interpret an empirical formula
• Distinguish between empirical and molecular formulas

Vocabulary: percent composition - empirical formula

Khan Academy - The Mole and Avogadro's Number

Khan Academy - Molecular and Empirical Formulas

Khan Academy - Formula and Mass Composition

Rutgers College Prep - Molar Mass and Percent Composition video pdf