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    Molar Mass of O (Oxygen)

    Molar Mass Calculator
    Chemical formula

    What is the molar mass of O?

    Answer

    M(O) =
    15.999 g/mol

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

    Elemental oxygen is made of O2 molecules: M(O2) = 31.998 g/mol = 0.031998 kg/mol.

    Contribution of each element
    Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
    Ooxygen115.99915.999 w = 100.00%

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

    See Also

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    Molar Mass of O (Oxygen): Step by Step. M(O) = 15.999 g/mol: the standard atomic weight of oxygen (IUPAC, CIAAW 2024). Molecule M(O2) = 31.998 g/mol.
    https://calculat.io/en/other/molar-mass/o/generated.jpgCopy

    Neighbouring elements of the periodic table

    FormulaM, g/mol
    B (boron)10.81
    C (carbon)12.011
    N (nitrogen)14.007
    O (oxygen)15.999
    F (fluorine)18.998
    Ne (neon)20.180
    Na (sodium)22.990
    Recalculate with different values ↑

    FAQ

    What is the molar mass of O?

    M(O) = 15.999 g/mol

    Why is the molar mass of oxygen 15.999 and not 32?

    15.999 g/mol is the mass of one mole of O atoms. Elemental oxygen is made of O₂ molecules: M(O₂) = 2 × 15.999 = 31.998 g/mol (32 in school problems); in SI units, 0.031998 kg/mol. In a problem about the gas, the molar mass of oxygen is usually M(O₂).

    How many grams are in 2 moles of O?

    m = n × M = 2 mol × 15.999 g/mol = 31.998 g.

    See Also