What is the molality of a solution of water and KCl if the freezing point of the solution is and ndash3 and degC (Kf 1.86 and degCm molar mass of water 18 g)?

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What is the molality of a solution of water and KCl if the freezing point of the solution is and ndash3 and degC (Kf 1.86 and degCm molar mass of water 18 g)?