Calculate the weight of iron (II) sulfate heptahydrate which is crystallized from the 80 g solution of iron (II) sulfate saturated at 50 degrees C by cooling it down to 10 degrees C a solution, Solubility: s(50 degrees C)=22 g FeSO4/100 g of solution
s(10 degrees C)=12.0 g FeSO4/100 g of solution