A 10000-lb batch of a 32.5 percent MgSO4 solution at 120ºF is cooled without appreciable evaporation to 70ºF. What weight of MgSO4-7H2O crystals will be formed (if it is assumed that the mother liquor leaving is saturated)? Solubility of MgSO4-7H2O at 70ºF is 26.3 lb MgSO4 per 100 lb solution. A. 2720 lb B. 3900 lb C. 3240 lb D. 1890 lb Ans: A

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