For the dissolution of LiCl in water, ∆H_soln = -37 kJ/mol. Which term would you expect to be the largest negative number: ∆H_solvent, ∆H_solute, or ∆H_mix?

검증된 단계별 안내

Understand the process of dissolution: When a solute dissolves in a solvent, three main enthalpy changes occur: ∆Hsolute (energy required to break apart the solute), ∆Hsolvent (energy required to separate the solvent molecules), and ∆Hmix (energy released when solute and solvent interact).

Recognize that ∆Hsoln is the overall enthalpy change for the dissolution process, given as -37 kJ/mol. This indicates that the process is exothermic, meaning it releases energy.

Consider the nature of each term: ∆Hsolute is typically positive because energy is required to break the solute into individual ions or molecules. ∆Hsolvent is also usually positive as energy is needed to disrupt the solvent structure.

Analyze ∆Hmix: This term is often negative because energy is released when the solute and solvent interact and form new bonds or attractions. Since the overall process is exothermic, ∆Hmix must be significantly negative to offset the positive values of ∆Hsolute and ∆Hsolvent.

Conclude that ∆Hmix is expected to be the largest negative number, as it must be sufficiently negative to result in the overall negative ∆Hsoln value of -37 kJ/mol.

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주요 개념

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Enthalpy of Solution (∆Hsoln)

The enthalpy of solution (∆Hsoln) refers to the heat change that occurs when a solute dissolves in a solvent. A negative value indicates that the process is exothermic, meaning heat is released into the surroundings. In this case, the dissolution of LiCl in water releases -37 kJ/mol, suggesting that the interactions between the solute and solvent are energetically favorable.

Enthalpy Changes in Dissolution

The dissolution process can be broken down into three components: ∆Hsolute (energy required to separate solute particles), ∆Hsolvent (energy required to separate solvent molecules), and ∆Hmix (energy released when solute and solvent interact). The overall enthalpy change (∆Hsoln) is the sum of these three components, which helps in understanding the energetics of the dissolution process.

Thermodynamic Favorability

In thermodynamics, a process is considered favorable if it results in a decrease in enthalpy (exothermic) or an increase in entropy. For the dissolution of LiCl, the negative ∆Hsoln suggests that the process is thermodynamically favorable. The largest negative term among ∆Hsolvent, ∆Hsolute, or ∆Hmix would likely be ∆Hmix, as it represents the energy released when the solute and solvent interact, contributing significantly to the overall exothermic nature of the solution process.

For the dissolution of LiCl in water, ∆Hsoln = -37 kJ/mol. Which term would you expect to be the largest negative number: ∆Hsolvent, ∆Hsolute, or ∆Hmix?

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Enthalpy of Solution (∆H<sub>soln</sub>)

Enthalpy Changes in Dissolution

Thermodynamic Favorability

For the dissolution of LiCl in water, ∆H_soln = -37 kJ/mol. Which term would you expect to be the largest negative number: ∆H_solvent, ∆H_solute, or ∆H_mix?