What is the enthalpy of solution of NH4CI?
Correct answer: C. 16.2 kJ/mol
- A. 15 kJ/mol
- B. -17 kJ/mol
- C. 16.2 kJ/mol
- D. -16.5 kJ/mol
Explanation
The enthalpy of solution (∆Hosol) of ammonium chloride (NH4Cl) is +16.2 kJ/mol. This value is positive, indicating that the dissolution process is endothermic, meaning it absorbs heat from the surroundings. Option C correctly identifies this value. Other options are incorrect because they either provide incorrect numerical values or incorrectly suggest that the process is exothermic with a negative enthalpy of solution.
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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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