Pick what to find — number of particles, moles, or mass — then enter your known values or a chemical formula, and the Avogadro's Number Calculator returns your result alongside Avogadro's constant and all related conversion values.
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Avogadro's constant
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Number of moles
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Number of particles
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Mass
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Avogadro's number is a fundamental physical constant representing the number of particles (atoms, molecules, ions, etc.) in one mole of any substance. Its exact value is 6.02214076 × 10²³ mol⁻¹.
Avogadro's number is used to convert between the mass you can measure in the lab and the actual number of atoms or molecules involved in chemical reactions. It bridges the macroscopic and microscopic worlds in chemistry.
Multiply the number of moles by Avogadro's number (6.022 × 10²³). The formula is: Number of particles = moles × 6.022 × 10²³.
Divide the mass in grams by the molar mass in g/mol. The formula is: moles = mass (g) ÷ molar mass (g/mol). You need to know the molar mass of the substance.
Amedeo Avogadro (1776-1856) was an Italian physicist who proposed that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules, known as Avogadro's law.
One mole represents exactly 6.02214076 × 10²³ elementary entities of any substance. For example, one mole of water contains that many water molecules, and one mole of carbon contains that many carbon atoms.
First convert particles to moles by dividing by Avogadro's number, then multiply by the molar mass. Formula: mass = (particles ÷ 6.022 × 10²³) × molar mass (g/mol).