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Question

What is the term used for the molecular mass of ionic compounds?

A
Ionic mass
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B
Ionic molecular weight
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C
Formula unit mass
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D
Molecular Mass
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Solution

The correct option is C Formula unit mass
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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