Differentiate between molecular mass and formula unit mass.

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Solution

Molecular mass Formula unit mass

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

It is used for those compounds that contain only non metals. It is used for those compounds that contain metals and non metals.

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

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Molecular mass	Formula unit mass
It is the sum of the masses of all the atoms in a molecule.	It is the sum of the masses of all ions present in the formula unit of a compound.
It is used for those compounds that contain only non metals.	It is used for those compounds that contain metals and non metals.
Eg. Water ( $H_{2} O$ ) has molecular mass of 18 u.	Eg. Sodium chloride ( $N a C l$ ) has formula unit mass of 58.5 u.