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Question
What is the term used for the molecular mass of ionic compounds?
Options:
A .  Ionic mass
B .  Ionic molecular weight
C .  Formula unit mass
D .  Molecular Mass
Answer: Option C
:
C
The word formula unit is used for the substances of which constituent particles are ions.
For example, magnesium chloride has a formula unit MgCl2
Its formula unit mass can be calculated as:
(1×Atomicmassofmagnesium)+(2×Atomicmassofchlorine)
=(1×24)+(2×35.5)=95u

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