Molar Mass of K (Potassium)

Molar Mass Calculator
Chemical formula Write symbols with a capital letter: CoCl2 is cobalt chloride, COCl2 is phosgene. A hydrate takes a dot: CuSO4·5H2O or CuSO4.5H2O

What is the molar mass of K?

Answer

M(K) =
39.098 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
Kpotassium139.09839.098 w = 100.00%

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

See Also

Recalculate with different values ↑

Neighbouring elements of the periodic table

FormulaM, g/mol
S (sulfur)32.06
Cl (chlorine)35.45
Ar (argon)39.95
K (potassium)39.098
Ca (calcium)40.078
Sc (scandium)44.956
Ti (titanium)47.867

FAQ

What is the molar mass of K?

M(K) = 39.098 g/mol

How is the molar mass of potassium different from its atomic weight?

Only in units: the relative atomic mass Ar(K) = 39.098 has no unit, and the molar mass M(K) = 39.098 g/mol is the mass of one mole of atoms (6.022 × 10²³ of them).

How many grams are in 2 moles of K?

m = n × M = 2 mol × 39.098 g/mol = 78.196 g.

See Also