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For sodium chloride, whose particles are ions, chemists calculate the:
AFormula unit mass
BFormula unit ratio
CFormula unit count
DFormula unit charge
Answer & Solution
Correct answer: A. Formula unit mass
1. Ionic solids have no separate molecules.
2. The sum over one formula unit is taken instead.
3. So chemists find the formula unit mass.
_Source: syllabus Science Class IX, Chapter 3, Atoms and Molecules._
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