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Calculate the magnitude of free energy i...

Calculate the magnitude of free energy in `KJ mol^(-1)` when `1` mole of a an ionic salt MX (s) is dissolved in water at `27^(@)C` . Given
Lattice energy of MX `= 780 KJ mol^(-1)`
Hydration energy of MX `=-775.0 KJ mol^(-1)`
Entropy change of dissolution at `27^(@)C = 40Jmol^(-1)K^(-1)`

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