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Question

Which of the following has no units?
Molarity
Normality
Molality
Mole fraction

A

Normality

B

Molality

C

Mole fraction

D

Molarity

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Solution

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Mole fraction of A in solution containing A and B $= \frac{n_{A}}{n_{A} + n_{B}} = \frac{m o l e}{m o l e}$ which cancels out.
Hence, it is unitless.

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