How to calculate Molecular mass? Give Examples.

1.	How to calculate Molecular mass? Give Examples.
Answer» Generally we use relative atomic masses of atoms for calculating the molecular mass of 1 mole of any molecular or ionic substances. Example: Molecular mass of H₂SO₄ Atomic mass of Hydrogen = 1 Atomic mass of sulphur = 32 Atomic mass of oxygen = 16 Molecular mass of H₂SO₄ = 2(Atomic mass of Hydrogen) + 1 (Atomic mass of sulphur) + 4 (Atomic mass of oxygen) = 2×1 + 32 + 4× 16 = 98 u. Calculation of molecular mass of hydrogen chloride: Atomic mass of hydrogen + Atomic mass of chlorine = 1 + 35.5 = 36.5 u.

Answer»

Generally we use relative atomic masses of atoms for calculating the molecular mass of 1 mole of any molecular or ionic substances.

Example: Molecular mass of H₂SO₄

Atomic mass of Hydrogen = 1

Atomic mass of sulphur = 32

Atomic mass of oxygen = 16

Molecular mass of H₂SO₄ = 2(Atomic mass of Hydrogen) + 1 (Atomic mass of sulphur) + 4

(Atomic mass of oxygen) = 2×1 + 32 + 4× 16 = 98 u.

Calculation of molecular mass of hydrogen chloride:

Atomic mass of hydrogen + Atomic mass of chlorine = 1 + 35.5 = 36.5 u.

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