if kf for water is 1.86°C/m, what is the freezing point of an aqueous solution of Sodium chloride prepared by mixing 427.0 g solute with 1.000 kg of water?   a. −4.36°C   b. −15.7°C   c. −13.6°C   d. −7.94°C   e. −18.3°C

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