The heat of solution for NaCl is?
Correct answer: B. Slightly endothermic
- A. Highly exothermic
- B. Slightly endothermic
- C. Zero
- D. Slightly exothermic
Explanation
The heat of solution for NaCl is slightly endothermic which allows for its dissolution spontaneousy in water since the increase in entropy compensates for the endothermic nature of the reaction. This is also why the container of the reaction gets slightly colder after the dissolution occurs.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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