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In ice-cream making, the temperature of the ingredients is kept below 0.0 degrees C in an ice-salt bath. Assuming that NaCl dissolves completely and forms an ideal solution, what mass of it is needed to lower the melting point of 7.5 kg of ice to -5.0 degrees C? (Kf of water is 1.86 degrees C/m.) the answer should be rounded to 2 significant figures.