When an ionic compound is placed in water, the positive end of the water molecule is attracted to the cation (+) of the ionic compound.

your answer would be a. 12.5 kg

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if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but