Science - 2018-19

CH.4 a - Avogadro's Principle

The student will investigate and understand that chemical quantities are based on molar relationships. Key concepts include:
a) Avogadro’s principle and molar volume.

Bloom's Levels:  Analyze; Understand

Adopted: 2010


  • The mole is a basic unit of measurement in Chemistry.
  • When compared at the same temperature and pressure, equal volumes of a two gases will contain equal numbers of atoms.

  • I can count the number of atoms in a sample quickly.


  • Atoms and molecules are too small to count by usual means. A mole is a way of counting an type of particle (atoms, molecules, and formula units).
  • Avogadro's number = 6.02 x 10^23 particles per mole.
  • Molar mass of a substance is its average atomic mass in grams from the Periodic Table.
  • Molar volume = 22.4 L/mole for any gas at standard temperature and pressure (STP).


In order to meet this standard, it is expected that students will

a)  perform conversions between mass, volume, particles, and moles of a substance.


Avogadro's number, empirical formula, hydrate, molar mass, mole, molecular formula, percent composition

Updated: Nov 19, 2017