A feed solution of $10000$ Ibm at $130\backslash$deg F containing $47$ Ib FeSO$4/100$ Ib total water is cooled to $80\backslash$deg F$,$ where FeSO$4\mathrm{.}7$H$2$O crystals are removed. The solubility of the salt is $30\mathrm{.}5$ Ib FeSO$4/100$ Ib total water. The average heat capacity of the feed solution is $0\mathrm{.}70$ btu$/$Ibm$.\backslash$deg F$.$ The heat of solution at $18\backslash$deg C is $-4\mathrm{.}4$ kcal$/$gmol $(-18\mathrm{.}4$ kJ$/$ gmol$)$ FeSO$4\mathrm{.}7$H$2$O$.$ Assume no water is vaporized.

yield of crystals and make a heat balance?