How it's calculated
n = m ÷ M
n = amount in moles, m = mass in grams, M = molar mass in g/mol. Particles N = n × 6.022×10²³ (Avogadro). Reverse: m = n × M.
Common questions
How do I convert grams to moles?
Divide the mass in grams by the molar mass in g/mol. For water (M = 18.015), 36 g is about 2 moles.
How many molecules are in one mole?
About 6.022 × 10²³, which is Avogadro's number. The calculator multiplies your moles by it to give the particle count.