Chapter 10 Vocabulary - Chemistry

mole

metric SI unit for amount of a substance

Avogadro’s number

The number of representative particles in a mole, 6.02 × 10²³

Representative particle

the species present in a substance, usually atoms, ions, molecules or formula units.

molar mass

The mass of a mole of an element

Avogadro’s law

states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

Standard temperature and pressure (STP)

a temperature of 0 C and a pressure of 101.3 kPa, or 1 atmosphere (atm).

Molar volume

The quantity, 22.4L, of a gas.

Percent composition

the percent by mass of each element in the compound.

emperical formula

gives the lowest whole-number ratio of the atoms or moles of the elements in a compound.