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With Na as 23 and Cl as 35.5, the formula unit mass of common salt is:
A38.5 u
B58.5 u
C48.5 u
D68.5 u
Answer & Solution
Correct answer: B. 58.5 u
1. One sodium and one chlorine make up the unit.
2. Twenty three plus thirty five point five is added.
3. So the answer is 58.5 u.
_Source: syllabus Science Class IX, Chapter 3, Atoms and Molecules._
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