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Questions  >>  CBSE XII  >>  Chemistry  >>  Solutions
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Q)

What is the mole fraction of a solute,in 2.5m aqueous solution?

$\begin{array}{1 1}0.043\\0.041\\0.046\\0.053\end{array} $

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A)
2.5m aqueous solution contains 2.5 moles of solute in 1000g of water.
Number of moles of water =$\large\frac{1000}{18g mol^{-1}}$
$\Rightarrow 55.55$
Total number of moles =2.5+55.55
$\Rightarrow 58.05$
Mole fraction of solute =$\large\frac{2.5}{58.05}$
$\Rightarrow 0.043$
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