Homework Answers
Lattice energy is positive.
Heat of hydration is negative.
And, the heat of solution is lattice energy plus heat of hydration.
So, A is lattice energy
B is heat of hydration.
C is heat of solution.
As C positive, so the heat of solution is endothermic.
As the heat of solution is positive, so the ionic compound will dissolve only if the entropy change overcomes the enthalpy cost.
Because
deltaG = deltaH - T x deltaS
So, the third and the last statements are correct.
Comment if any problem
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