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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
Relative atomic weight
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Solution

The correct option is C Formula unit mass
The word formula unit is used for those substances whose constituent particles are ions. For example, Magnesium Chloride has a formula unit MgCl2. Its formula unit mass can be calculated as:
1×24+2×35.5=93.5u

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