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What mass of salt (NaCl) should you add to 1.42L of water in an ice-cream maker to make a solution that freezes at 12.0C ?

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What mass of salt (NaCl) should you add to 1.42L of water in an ice-cream maker to make a solution that freezes at 12.0C ? Assume complete dissociation of the NaCl and a density of 1.00g/mL for water and use Kf=1.86C/m Express your answer in grams to three significant figures

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