Molar Mass of F (Fluorine)

Molar Mass Calculator

What is the molar mass of F?

Answer

M(F) =

18.998 g/mol

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

Elemental fluorine is made of F₂ molecules: M(F₂) = 37.996 g/mol = 0.037996 kg/mol.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Ffluorine	1	18.998	18.998 w = 100.00%	100.00%

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

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Neighbouring elements of the periodic table

Formula	M, g/mol
C (carbon)	12.011
N (nitrogen)	14.007
O (oxygen)	15.999
F (fluorine)	18.998
Ne (neon)	20.180
Na (sodium)	22.990
Mg (magnesium)	24.305

FAQ

What is the molar mass of F?

M(F) = 18.998 g/mol

Why is the molar mass of fluorine 18.998 and not 38?

18.998 g/mol is the mass of one mole of F atoms. Elemental fluorine is made of F₂ molecules: M(F₂) = 2 × 18.998 = 37.996 g/mol (38 in school problems); in SI units, 0.037996 kg/mol. In a problem about the gas, the molar mass of fluorine is usually M(F₂).

How many grams are in 2 moles of F?

m = n × M = 2 mol × 18.998 g/mol = 37.996 g.

See Also