Chemistry Chapter 10

Empirical Formulas; Molar Mass, Volume, Percent Composition Vocabulary

Mole

Amount of substance that contains 6.02 × 10²³ representative particles of that substance

Avogrados Number

Number of representative particles in 1 mole: 6.02 × 10²³

Representative Particle

Kind of particles present in a substance, such as atoms, molecules, or formula units

Molar Mass

Mass in grams of one mole of an compound or element

Avogadros Hypothesis

Equal volumes of gases at the same temperature and pressure contain equal numbers of particles

Molar Volume

22.4 liters of volume occupied by one mole of gas at STP

Standard Temperature and Pressure (STP)

0 degree celsius and 101.3 KPa

Percent Composition

The percent by mass of each element in a compound

Empirical Formula

Formula with the lowest whole - number ratio of elements in a compound