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

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Solution

Molecular mass
[1 Mark] Formula unit mass
[1 Mark]

It is the sum of the masses of all the atoms in a molecule. It is the sum of the masses of all atoms in a formula unit of a compound.

For example: Water ( $H_{2} O$ ) has molecular mass of 18 u. For example: Sodium chloride ( $N a C l$ ) has formula unit mass of 58.5 u.

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Molecular mass [1 Mark]	Formula unit mass [1 Mark]
It is the sum of the masses of all the atoms in a molecule.	It is the sum of the masses of all atoms in a formula unit of a compound.
For example: Water ( $H_{2} O$ ) has molecular mass of 18 u.	For example: Sodium chloride ( $N a C l$ ) has formula unit mass of 58.5 u.