1.

Na 2 SO 4 . 10H 2 O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na 2 SO 4 . The final concentration of the solute in the solution is 10%. The weight of crystals is

A. 20
B. 32.2
C. 45.35
D. 58.65
Answer» E.


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