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Glossary Science & Engineering

Molecular weight

Molecular weight, or molar mass, is the mass of one mole of a substance, found by adding the atomic weights of every atom in its formula.

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In more detail

Water, H₂O, is 2 × 1.008 + 15.999 = 18.015 g/mol. It converts between grams and moles, the first step in any concentration or reaction calculation.

Try these tools

Molecular Weight Calculator

Calculate the molecular weight (molar mass) of any chemical formula, including compounds with parentheses like Ca(OH)2.

See also

  • Glossary Molarity
    Molarity is the concentration of a solution: moles of solute per litre of solution, written M.
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