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$8.0575\times 10^{-2}Kg$ of Glauber's salt is dissolved in water to obtain $1dm^3$ of a solution of density 1077.2$Kgm^{-3}$.Calculate the molarity ,molality and mole fraction of $Na_2SO_4$ in solution.

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$(A)\;0.1M,0.15m,2.3\times 10^{-4}$

$(B)\;0.2M,0.24m,4.3\times 10^{-3}$

$(C)\;0.325M,0.3m,2.3\times 10^{-3}$

$(D)\;0.432M,0.123m,1.3\times 10^{-5}$

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