Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is________________?
Correct answer: D. 58.65
- A. 20
- B. 32.2
- C. 45.35
- D. 58.65
Explanation
The crystals contain Na2SO4 in the fraction 142/322 of their mass. A solute balance gives 30 = 0.10(100 - W) + (142/322)W, yielding W = 58.65 kg of decahydrate crystals.
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