A. If the energies required to separate the solvent and solute molecules are H s

Question

A. If the energies required to separate the solvent and solute molecules are Hsolvent = 25.6 kJ/mol and Hsolute = 18.9 kJ/mol, what is the enthalpy of solution (Hsoln) if the enthalpy change when the solute and solvent combine (Hmix) is -51.7 kJ/mol?

B. The solubility of sodium chloride at 25oC in water is 35 g / 100 g water. What term would be used to describe a solution at 25oC that contains 38g of NaCl in 100 g of water?

C. The solubility of sodium chloride at 25oC in water is 35 g / 100 g water. What term would be used to describe a solution at 25oC that contains 30g of NaCl in 100 g of water?

Explanation / Answer

1.

Hsoln = delta H(solute) + delta H(solvent) + delta H(mix)

          = (25.6 + 18.9 -51.7) kJ/mol

         = -7.2 kJ/mol

2.

the term would be super saturated.

3.

the term would be unsaturated

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