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Question

Differentiate between molecular mass and formula unit mass.
[2 Marks]
[NCERT]

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Solution

Molecular mass Formula unit mass
It is the sum of the masses of all the atoms in a molecule.
[0.5 Marks]
It is the sum of the masses of all atoms in a formula unit of a compound.
[0.5 Marks]
For example: Water (H2O) has molecular mass of 18 u.
[0.5 Marks]
For example: Sodium chloride (NaCl) has formula unit mass of 58.5 u.
​​​​​​​ [0.5 Marks]



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