Which of the following terms are unitless ?

(a) Molality (b) Molarity (c) Mole fraction (d) Mass per cent

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Solution

c & d

Both mole fraction and mass per cent are unitless as both are ratios of moles and mass respectively.

$Mole fraction=Number of moles of soluteNumber of moles of solution=molesmoles$
$= \frac{N u m b e r o f m o l e s o f s o l v e n t}{N u m b e r o f m o l e s o f s o l u t i o n} = \frac{m o l e s}{m o l e s}$
$M a s s p e r c e n t = \frac{M a s s o f s o l u t e i n g r a m}{M a s s o f s o l u t i o n i n g r a m} \times 100$

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Which of the following terms are unitless ? (a) Molality (b) Molarity (c) Mole fraction (d) Mass per cent

Which of the following terms are unitless ?

(a) Molality (b) Molarity (c) Mole fraction (d) Mass per cent