The enthalpy of hydration associated with anhydrous LiI forming LiI?2H2O is -45.

Question

The enthalpy of hydration associated with anhydrous LiI forming LiI?2H2O is -45.53 kJ/mol. The enthalpy of solution for LiI?2H2O is -14.77 kJ/mol. What is the enthalpy of solution for LiI?

Explanation / Answer

the heat of solution for Lithium Chloride covers this: LiCl (solid) --> Li+ (aq) & Cl- (aq) all three species are usually listed in most books, though most books vary slightly in their values LiCl (solid).... dHf = -408.3 kJ/mole Li+ (aq) ........ dHf = -278.5 kJ Cl- (aq) ...... dHf = -167.2 dH reaction = dHf products - dHf reactants dH = (-278.5 & - 167.2) - ( -408.3) dH = (-445.7) + 408.3 dH = - 37.4 kJ/mol

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