How to Calculate Moles

The mole bridges the atomic world and the laboratory scale. One mole contains exactly 6.022 × 10²³ particles and has a mass equal to the molar mass in grams.

Step-by-step

1. Write the chemical formula and look up molar mass (g/mol) from the periodic table.
2. Given mass: n = mass (g) ÷ molar mass (g/mol).
3. Given particles: n = particle count ÷ 6.022 × 10²³.
4. Given moles: mass = n × molar mass; particles = n × 6.022 × 10²³.
5. Use mole ratios from balanced equations for stoichiometry.
6. Enter values in our Mole Calculator for instant conversions.

Open the Mole Calculator to apply these steps with your own numbers instantly.

Frequently asked questions