Molar Mass of H (Hydrogen)

Molar Mass Calculator

What is the molar mass of H?

Answer

M(H) =

1.0080 g/mol

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

Elemental hydrogen is made of H₂ molecules: M(H₂) = 2.0160 g/mol = 0.0020160 kg/mol.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Hhydrogen	1	1.0080	1.0080 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
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 H?

M(H) = 1.0080 g/mol

Why is the molar mass of hydrogen 1.0080 and not 2?

1.0080 g/mol is the mass of one mole of H atoms. Elemental hydrogen is made of H₂ molecules: M(H₂) = 2 × 1.0080 = 2.0160 g/mol (2 in school problems); in SI units, 0.0020160 kg/mol. In a problem about the gas, the molar mass of hydrogen is usually M(H₂).

How many grams are in 2 moles of H?

m = n × M = 2 mol × 1.0080 g/mol = 2.0160 g.

See Also