Calculated the Gibbs energy change on dissolving one mole of sodium chloride at `25^(@)C`.
Lattice `=+ 777.0 kJ mol^(-1)`
Hydration of `NaCI =- 774.0 kJ mol^(-1)`
`DeltaS` at `25^(@)C = 40 J K^(-1) mol^(-1)`

Explanation

To calculate the Gibbs energy change (ΔG) on dissolving one mole of sodium chloride (NaCl) at 25°C, we will follow these steps:

### Step 1: Convert Temperature to Kelvin
The temperature given is 25°C. To convert this to Kelvin, we use the formula:
\[ T(K) = T(°C) + 273 \]
So,
\[ T = 25 + 273 = 298 \, K \]

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