Molar Mass of La (Lanthanum)

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 La?

Answer

M(La) =
138.91 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
Lalanthanum1138.91138.91 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
Xe (xenon)131.29
Cs (caesium)132.91
Ba (barium)137.33
La (lanthanum)138.91
Ce (cerium)140.12
Pr (praseodymium)140.91
Nd (neodymium)144.24

FAQ

What is the molar mass of La?

M(La) = 138.91 g/mol

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

Only in units: the relative atomic mass Ar(La) = 138.91 has no unit, and the molar mass M(La) = 138.91 g/mol is the mass of one mole of atoms (6.022 × 10²³ of them).

How many grams are in 2 moles of La?

m = n × M = 2 mol × 138.91 g/mol = 277.82 g.

See Also