At 60 degrees Celsius, a 225-g sample of KNO3 is entirely dissolved in 250 g of water. The temperature of the solution is progressively lowered to 0 °C. The solubility of KNO3 in water at this lower temperature is 12.1 g/100 g water. At 0 degrees Celsius, what is the mass of KNO3 that will crystallize out of the solution?

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