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    Molar Mass of O2 (Oxygen)

    Molar Mass Calculator
    Chemical formula

    What is the molar mass of O2?

    Answer

    M(O2) =
    31.998 g/mol

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

    One O atom: M(O) = 15.999 g/mol; O2 is two atoms.

    Contribution of each element
    Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
    Ooxygen215.99931.998 w = 100.00%

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

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    <a href="https://calculat.io/en/other/molar-mass/o2">Molar Mass of O2 (Oxygen): Step by Step - Calculatio</a>Copy
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    Molar Mass of O2 (Oxygen): Step by Step. M(O2) = 31.998 g/mol: 2 × 15.999 (O). Atom M(O) = 15.999 g/mol. Step-by-step calculation from IUPAC atomic weights.
    https://calculat.io/en/other/molar-mass/o2/generated.jpgCopy

    Molar masses of substances nearby

    FormulaM, g/mol
    C₂H₆ (ethane)30.070
    P (phosphorus)30.974
    CH₅N (methylamine)31.058
    O₂ (oxygen)31.998
    CH₃OH (methanol)32.042
    N₂H₄ (hydrazine)32.046
    S (sulfur)32.06
    Recalculate with different values ↑

    FAQ

    What is the molar mass of O2?

    M(O₂) = 31.998 g/mol

    How to calculate the molar mass of O₂?

    Add up the atomic weights of all the atoms in the formula: 2 × 15.999 = 31.998 g/mol.

    How many grams are in 2 moles of O₂?

    m = n × M = 2 mol × 31.998 g/mol = 63.996 g.

    See Also