What is the molecular mass of hydrogen (H₂)?

The molecular mass of hydrogen (H₂) is 2 atomic mass units (u).

Explanation

• Hydrogen exists as a diatomic molecule (H₂)
• Each hydrogen atom has an atomic mass of 1 u

So,
Molecular mass of H₂ = 1 u + 1 u = 2 u

In Different Units

• 2 u (atomic mass unit)
• 2 g/mol (molar mass)

Key Concept

Molecular mass = Sum of atomic masses of all atoms in a molecule

Example

• H₂ → 1 + 1 = 2 u
• O₂ → 16 + 16 = 32 u

Practical Insight

Understanding molecular mass helps in:

• Chemical calculations
• Stoichiometry
• Balancing equations