QJEEM21Chdc8a: JEE Main 2021 Chemistry - Class 11 JEEM21Chdc8a Solution: The mole fraction of a solute in a 100 molal aqueous solution…

Question

Verified Solution • 2025–26 Session moderate

The mole fraction of a solute in a 100 molal aqueous solution is ___________

\times

10^{$-$ 2}. (Round off to the Nearest Integer).

[Given : Atomic masses : H : 1.0 u, O : 16.0 u ]

Accepted Answer

Let weight of H₂O = 1000 g

Moles of solute = 100

(mole)H₂O =

\frac{1000}{18}

Mole fraction of solute =

\frac{m o l e o f s o l u t e}{T o t a l m o l e s}

= \frac{100}{100 + \frac{1000}{18}} = \frac{1800}{2800}

X_{s o l u t e} = 64 \times 10^{- 2}

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