Atom Counter Calculator

Convert Moles to Number of Atoms

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Mole to Atoms Calculator

Convert moles to number of atoms using Avogadro's number.

Number of Atoms: -

Molecule Counter

Calculate number of molecules and constituent atoms in a compound.

Number of Molecules: -

Understanding Atomic Quantities

Avogadro's Number

Key concepts about Avogadro's number:

  • NA = 6.02214076 × 10²³ particles/mol
  • Defines the mole
  • Applies to atoms, molecules, or any particles
  • Universal conversion factor

Molecular Quantities

Important considerations:

  • Atomic vs molecular mass
  • Polyatomic molecules
  • Isotopic abundance
  • Chemical formulas
  • Empirical formulas

Applications

Atomic calculations are used in:

  • Stoichiometry
  • Nuclear chemistry
  • Quantum mechanics
  • Material science
  • Analytical chemistry

Common Conversions

Useful reference values:

  • 1 mol H atoms = 6.022 × 10²³ atoms
  • 1 mol H₂O = 6.022 × 10²³ molecules
  • 1 mol H₂O = 1.807 × 10²⁴ total atoms
  • 1 mol NaCl = 1.204 × 10²⁴ total ions

Essential Atomic Quantity Formulas

Number of Atoms

N = n × NA

where NA = 6.02214076 × 10²³

Total Atoms in Compound

Ntotal = n × NA × (sum of atoms per molecule)

Mass-Atom Relationship

N = (m/M) × NA

where M is molar mass