Molar Mass of H2 (Hydrogen)

Molar Mass Calculator

What is the molar mass of H₂?

Answer

M(H₂) =

2.0160 g/mol

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

One H atom: M(H) = 1.0080 g/mol; H₂ is two atoms.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Hhydrogen	2	1.0080	2.0160 w = 100.00%	100.00%

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

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Molar Mass of H (Hydrogen): Step by Step

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Molar masses of substances nearby

Formula	M, g/mol
H (hydrogen)	1.0080
H₂ (hydrogen)	2.0160
He (helium)	4.0026
Li (lithium)	6.94
Be (beryllium)	9.0122
B (boron)	10.81
C (carbon)	12.011

FAQ

What is the molar mass of H2?

M(H₂) = 2.0160 g/mol

How to calculate the molar mass of H₂?

Add up the atomic weights of all the atoms in the formula: 2 × 1.0080 = 2.0160 g/mol.

How many grams are in 2 moles of H₂?

m = n × M = 2 mol × 2.0160 g/mol = 4.0320 g.

See Also