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  • The mole fraction of a solute in a 100 molal aqueous solution is _________ . (Round off to the Nearest Integer). [Given : Atomic masses <img alt="H:1.0\; u,O:16.0\; u" src="/latex

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]
Option: 1 64
Option: 2 -
Option: 3 -
Option: 4 -

Answers (1)

best_answer

100 molal aqueous solution means

there is 100 moles solute in 1 kg = 1000 gm water.

So, 

moles of water = 1000/18 grams

Now,

\text { mole-fraction of solute }=\frac{\mathrm{n}_{\text {solute }}}{\mathrm{n}_{\text {solute }}+\mathrm{n}_{\text {solvent }}}

\text { mole-fraction of solute }=\frac{100}{100+\frac{1000}{18}}\text { mole-fraction of solute }=\frac{1800}{2800}=0.6428\text { mole-fraction of solute }=64.28 \times 10^{-2}

Ans = 64

Posted by

Kuldeep Maurya

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