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$8.0575 × 10^{–2}$ kg of Glauber’s salt ($Na_2SO_4.10H_2O$) is dissolved in water to obtain 1 $dm^3$ of a solution of density $1077.2 kgm^{–3}$. Calculate the mole fraction of $Na_2SO_4$ in the solution.

1 Answer

Weight of solution =$\large\frac{1000\times 1077.2\times 1000}{10^6}=$$1077.2g$
Weight of solvent =1077.2-80.575
$\Rightarrow 996.625$
Moles of water=$\large\frac{996.625}{18}$$=55.3$
Hence (A) is the correct answer.
answered Jun 6, 2014 by sreemathi.v