A 225-g sample of KNO3 is completely dissolved in 250 g of water at 60 °C. The solution is gradually cooled to 0 °C. At this cooler temperature, the solubility of KNO3 in water is 12.1 g/100 g water. What is the mass of KNO3 that will crystallize out of the solution at 0 °C?

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