(40) GCSE Chemistry Revision "Avogadro's Constant 2"

Avogadro's constant

The number of atoms or molecules in one mole, approximately 6.02 x 10^23.

Mole

A unit in chemistry representing 6.02 x 10^23 particles (atoms, molecules, etc.).

Relative atomic mass

The mass of an atom of a chemical element compared to the mass of carbon-12.

Number of moles

Calculated using the formula: mass (in grams) / relative atomic mass.

Relative formula mass

The sum of the relative atomic masses of the elements in a compound.

Magnesium (Mg)

A chemical element with a relative atomic mass of 24.

Lithium (Li)

A chemical element with a relative atomic mass of 7.

Calcium oxide (CaO)

A compound composed of one calcium atom and one oxygen atom.

Molecules in a mole

Each mole contains Avogadro's constant, or 6.02 x 10^23 molecules.

Water (H2O)

A compound consisting of two hydrogen atoms and one oxygen atom.

Total number of atoms

For a compound, it equals the number of molecules multiplied by the number of atoms per molecule.