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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× Atomic mass of magnesium)+(2× Atomic mass of chlorine)
=(1×24)+(2×35.5)=95u
 

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