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Calculate the amount of CaCl(2) (molar m...

Calculate the amount of `CaCl_(2)` (molar mass = 111g `"mol"^(-1)`) which must be added to 500 g of water of lower its freezing point by 2K, assuming `CaCl_(2)` is completely dissociated.
(Kf for water = 1.86 k kg `"mol"^(-1)`).

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