Which of the following is false about the dissolution of ammonium nitrate? NH4NO3(s) ⇌ NH4+(aq) + NO3-(aq) A. The enthalpy of dissolution of NH4NO3 is endothermic. B. The interactions among similar particles or molecules are weaker than the interactions among the dissimilar particles or molecules. C. The Gibbs free energy of dissolution of NH4NO3 is negative. D. Lower energy is involved when water molecules surround the dissolved ions than when the water molecules and ammonium nitrate particles are separated.
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Chemical equilibrium and ionic equilibrium are two major concepts in chemistry. Ionic equilibrium deals with the equilibrium involved in an ionization process while chemical equilibrium deals with the equilibrium during a chemical change. Ionic equilibrium is established between the ions and unionized species in a system. Understanding the concept of ionic equilibrium is very important to answer the questions related to certain chemical reactions in chemistry.
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Instant cold packs usually employ the dissolution of ammonium nitrate to work. When the pack is twisted, the inner bag of water ruptures and solid NH4NO3 is dissolved inside the pack. This process leads to a temperature drop to around 0°C.
Which of the following is false about the dissolution of ammonium nitrate?
NH4NO3(s) ⇌ NH4+(aq) + NO3-(aq)
A. The enthalpy of dissolution of NH4NO3 is endothermic.
B. The interactions among similar particles or molecules are weaker than the interactions among the dissimilar particles or molecules.
C. The Gibbs free energy of dissolution of NH4NO3 is negative.
D. Lower energy is involved when water molecules surround the dissolved ions than when the water molecules and ammonium nitrate particles are separated.
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