The solubility of KNO3 at 75 degrees celsius is 155g per 100 g of water, and at 25 degrees celsius it is 38.0g per 100 g of water. What mass in grams will crystallize out of the solution if exactly 100.0 g of the saturated solution at 75 degrees celsius is cooled down to 25 degrees celsius?

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A: The given graph is :

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