Moles Calculator
Moves between grams and moles for any substance. Choose what to find; the field for that value is ignored.
Answer
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Amount — mol
Mass —
Molar mass — g/mol
Number of particles —
The formula
moles = mass ÷ molar mass particles = moles × 6.02214076 × 10²³
Mass in grams and molar mass in g/mol give moles. The Avogadro constant is exact by definition.
What to watch out for
Particles means whatever the formula unit is: atoms for an element, molecules for water, formula units for table salt.
Frequently Asked Questions
How many moles are in 18 g of water?
Water has a molar mass of 18.015 g/mol, so 18 g is 0.9992 mol.
How many molecules are in a mole?
6.02214076 × 10²³, the Avogadro constant.