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Calculate the free enegry change when 1m...

Calculate the free enegry change when `1mol` of `NaCI` is dissolved in water at `298K`. Given:
a. Lattice enegry of `NaCI =- 778 kJ mol^(-1)`
b. Hydration energy of `NaCI - 774.1 kJ mol^(-1)`
c. Entropy change at `298 K = 43 J mol^(-1)`

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