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

Ionic mass

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Ionic molecular weight

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Formula unit mass

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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 $M g C l_{2}$

Its formula unit mass can be calculated as:
$(1 \times A t o m i c m a s s o f m a g n e s i u m) + (2 \times A t o m i c m a s s o f c h l o r i n e)$

= $(1 \times 24) + (2 \times 35.5) = 95 u$

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N a_{2} S_{2} O_{3}

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K_{2} C r_{2} O_{7}

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