Molar Mass of He (Helium)

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 He?

Answer

M(He) =
4.0026 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
Hehelium14.00264.0026 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
H (hydrogen)1.0080
He (helium)4.0026
Li (lithium)6.94
Be (beryllium)9.0122
B (boron)10.81
C (carbon)12.011
N (nitrogen)14.007

FAQ

What is the molar mass of He?

M(He) = 4.0026 g/mol

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

Only in units: the relative atomic mass Ar(He) = 4.0026 has no unit, and the molar mass M(He) = 4.0026 g/mol is the mass of one mole of atoms (6.022 × 10²³ of them).

How many grams are in 2 moles of He?

m = n × M = 2 mol × 4.0026 g/mol = 8.0052 g.

See Also