Why dissolution of some solid compounds ...

Why dissolution of some solid compounds is exothermic while that of some others is endothermic?

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If solute - solvent interactions are stronger than solute- solute or solvent - solvent interactions, energy is released and the dissolution is exothermic. If solute- solvent interactions are weaker than solute-solute or solvent- solvent interaction, energy is absorbed and the dissolution is endothermic.

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Dissolution of calcium chloride in water is exothermic process while that of ammonium nitrate is endothermic process, the observation is

Solubility of calcium chloride decreases with increase in temperature and that of ammonium nitrate increases with increase in temperature

Solubilities of both decreases with increase in temperature

Solubilities of both increases with increase in temperature

Solubilities of calcium chloride increases with increase in temperature and that of ammonium nitrate decrease with increase in temperature

The lattice energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water in the form of ions is endothermic to the extent of 1 kcal/mol. If the hydration energies of Na^(+) and Cl^(-) are in the ratio 6: 5 , what is the enthalpy of hydration of Nation ?

`-8.5` kcal `mol^(-1)`

`-97.64` kcal `"mol"^(-1)`

`+82.6` kcal `"mol"^(-1)`

`+100` kcal `"mol"^(-1)`

Why dissolution of some solid compounds is exothermic while that of some others is endothermic?

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Dissolution of calcium chloride in water is exothermic process while that of ammonium nitrate is endothermic process, the observation is

The lattice energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water in the form of ions is endothermic to the extent of 1 kcal/mol. If the hydration energies of Na^(+) and Cl^(-) are in the ratio 6: 5 , what is the enthalpy of hydration of Nation ?

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