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  4. Mole fraction of the solute in a 1.00 molal aqueous solution is

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Q. Mole fraction of the solute in a $1.00$ molal aqueous solution is

BITSATBITSAT 2019

Solution:

$1.00$ molal solution means $1$ mole of solute in $1\, kg$ (or $1000 g$ ) of water.
Number of moles of solute $=1$
Number of moles of solvent $=\frac{1000}{18}=55.55$
Mole fraction of Solute $=\frac{1}{1+55.55}=0.01768$