(Answered) 1 how is freezing point depression and heat of dissolution

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1. How is freezing point depression and heat of dissolution related to each other?
2. what does the heat of dissolution measure?
3. Why is the heat of dissolution of NaCl need to be considered when NaCl is being used as a deicer?
4. Does the heat of dissolution decrease when concentration of a compound such as NaCl is increased?

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