Chemistry: Mole Concepts and Formulas

Key Concepts in Chemistry

• Avogadro's number is 6.02 x 10^23, representing the number of representative particles in a mole of a substance.

Molecular Composition

• Empirical formula is the simplest ratio of the different elements in a given compound.
• Molecular formula is the chemical formula of a molecule that includes the number of atoms of each element present in a single molecule.

Moles and Mass

• Mole concept: the idea that the number of particles and mass of a substance can be calculated using the SI unit mole.
• Molar mass is the mass in grams of a mole of a substance.

Chemical Properties

• Percent composition is the ratio of mass that each element in a compound contributes to the total mass of the compound.

Related Concepts

• Density is a measure of mass per unit volume.
• Formula unit is a unit of measurement for ionic compounds.
• Gram atomic mass is the mass of an atom of an element in grams.
• Gram formula mass is the mass of a formula unit of a compound in grams.
• Gram molecular mass is the mass of a molecule of a substance in grams.
• Ion is a charged particle formed when an atom gains or loses electrons.
• Molecule is a group of two or more atoms chemically bonded together.
• Representative particles are individual units of a substance, such as atoms, molecules, or ions.
• Scientific notation is a way of writing very large or very small numbers in a compact form.