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  4. 0.1 mole of NaCl is dissolved in 100 g of water. The mole fraction of NaCl is

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Q. $0.1$ mole of $NaCl$ is dissolved in $100\, g$ of water. The mole fraction of $NaCl$ is

TS EAMCET 2018

Solution:

Mole fraction of $NaCl$

$=\frac{\text { Number of mole of } NaCl }{\text { Total number of mole of solution }}$

$100\, g$ water $=\frac{100}{18}$ mol water $=5.5\, mol$

Mole fraction of $NaCl =\frac{0.1}{0.1+5.5}=\frac{0.1}{5.6}=0.178$