Mole calculator
Find the amount of substance and the number of specified particles.
Formula
n = mass (g) / M (g/mol); N = n × 6.02214076 × 10²³
Substance mass: 18.02 g · Amount ≈ (18.02 g × 0.001 kg/g)×1000÷(18.02) · Particle count ≈ (1)×6.02214076e23
How to use
- Enter the mass of the pure substance.
- Enter its molar mass in g/mol.
- Read moles and the estimated particle count.
Examples
- 36.04 g at 18.02 g/mol gives 2 mol and 1.204428152 × 10²⁴ molecules.
Frequently asked questions
Which particles are counted?
Atoms, molecules or formula units, according to the substance whose molar mass you enter.
Is Avogadro’s constant exact?
Yes: 6.02214076 × 10²³ per mol. Mass measurements and molar masses can still be rounded.
Does the tool look up molar mass?
No. Enter the correct composition, including any water of hydration.
Sources
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