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You have an aqueous solution of NaCl that has a freezing point of -4.85°C. What mass...

You have an aqueous solution of NaCl that has a freezing point of -4.85°C. What mass (in grams) of NaCl must be added to 1000 g of this solution to lower the freezing point to -12.00°C? (Assume a van't Hoff factor of 1.9 for NaCl). (Kf for water is 1.86°C・kg/mol).

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