Describe the enthalpy changes during the dissolving of NaCl into CH 4 : Which of

Question

Describe the enthalpy changes during the dissolving of NaCl into CH4:

Which of the following solutions will have the most particles present per liter?

What will be the boiling point of a 5 molal solution of LiF? Kb for water = 0.512

A. The enthalpy of separating the solute is highly endothermic; the enthalpy of separating the solvent is slightly endothermic; the enthalpy of mixing is slightly exothermic; the enthalpy of solution is highly endothermic. B. The enthalpy of separating the solute is slightly endothermic; the enthalpy of separating the solvent is highly endothermic; the enthalpy of mixing is slightly exothermic; the enthalpy of solution is highly endothermic. C. The enthalpy of separating the solute is highly endothermic; the enthalpy of separating the solvent is slightly endothermic; the enthalpy of mixing is highly exothermic; the enthalpy of solution is slightly endothermic. D. The enthalpy of separating the solute is slightly endothermic; the enthalpy of separating the solvent is slightly endothermic; the enthalpy of mixing is highly exothermic; the enthalpy of solution is highly exothermic.

Explanation / Answer

1) A) The enthalpy of separating the solute is highly endothermic; the enthalpy of separating the solvent is slightly endothermic; the enthalpy of mixing is slightly exothermic; the enthalpy of solution is highly endothermic.

2) A) 0.4 M KBr

3) delta Tf = 0.512 x 5 x 2 = 5.1

=> BP = 105.1 C = A)

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