Molecular mass of hydrogen (H2) is___u.

Hint: Molecular mass of a compound can be calculated as the sum total of masses of all the elements present in that compound. It is the atomic mass of an element multiplied by the total number of that element in the compound.

• Molecular mass is expressed in the unit amu.
• Hydrogen or H2 is the first element of the periodic table.
• It has 1 as its atomic number and atomic mass as 1u.
• Naturally present in the gaseous form, hydrogen has no colour or odour.
• It is believed to be the most abundant element in the universe.

Atomic Mass = No. of protons + No. of neutrons

Hence, the atomic mass of hydrogen (H) = 1 + 0 = 1 u

The molecular formula of hydrogen is (H2), so the molecular mass = 2 x 1 = 2u

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

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