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    Molar Mass of H2O (Water)

    Molar Mass Calculator
    Chemical formula

    What is the molar mass of H2O?

    Answer

    M(H2O) =
    18.015 g/mol

    Atomic weights: IUPAC standard values (CIAAW, 2024).

    Contribution of each element
    Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
    Hhydrogen21.00802.0160 w ≈ 11.19%
    Ooxygen115.99915.999 w ≈ 88.81%
    Σ = 18.015 g/mol w = 100%

    Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

    Mass fractions of the elements

    H 11.19%

    Related Calculations

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    <a href="https://calculat.io/en/other/molar-mass/h2o">Molar Mass of H2O (Water): Step by Step - Calculatio</a>Copy
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    Molar Mass of H2O (Water): Step by Step. M(H2O) = 18.015 g/mol: 2 × 1.0080 (H) + 15.999 (O). Mass fractions: O 88.81%, H 11.19%.
    https://calculat.io/en/other/molar-mass/h2o/generated.jpgCopy

    Molar masses of substances nearby

    FormulaM, g/mol
    O (oxygen)15.999
    CH₄ (methane)16.043
    NH₃ (ammonia)17.031
    H₂O (water)18.015
    F (fluorine)18.998
    HF (hydrogen fluoride)20.006
    Ne (neon)20.180
    Recalculate with different values ↑

    FAQ

    What is the molar mass of H2O?

    M(H₂O) = 18.015 g/mol

    How to calculate the molar mass of H₂O?

    Add up the atomic weights of all the atoms in the formula: 2 × 1.0080 + 15.999 = 18.015 g/mol.

    How many grams are in 2 moles of H₂O?

    m = n × M = 2 mol × 18.015 g/mol = 36.030 g.

    See Also