Five thousand kilograms of sodium chloride was subjected for dissolution in a water

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Five thousand kilograms of sodium chloride was subjected for dissolution in a water with 400 K.
The solubility of the NaCl is 40% in water. Afterwards, cooling effect was done to the solution at
290K, at which the temperature its solubility is around 27.45%.
a. Determine the weight of the water needed for the solution and weight of the NaCl
produced from the operation.
b. What will be the weight of the crystals produced if 8% of the original water evaporates
on the cooling process?

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