What is the triangle cap h sub sol for KBr rightarrow cap k raised to the plus plus Br raised to the negative power power ? The lattice energy is negative 679 kJ , the enthalpy of hydration for cap k raised to the plus power is negative 336 kJ/mol , and the enthalpy of hydration for Br raised to the negative power is negative 284 kJ/mol Use triangle cap h sub sol is equal to negative triangle cap h sub lat plus triangle cap h sub hydr
Add the hydration enthalpies: −336 + (−284) = −620 kJ/mol. Then use ΔHsol = −ΔHlat + ΔHhydr, with ΔHlat = −679 kJ/mol: ΔHsol = −(−679) + (−620) = 59 kJ/mol. The correct choice is 59 kJ/mol.
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