The entropy change during phase transformation (fusion) is calculated using the formula: $\Delta S_{\text{fusion}} = \frac{\Delta H_{\text{fusion}}}{T_f}$ Given: Latent heat of fusion, $\Delta H_{\text{fusion}} = 2930\text{ J/mol}$ Temperature, $T_f = 27^\circ\text{C} = 27 + 273 = 300\text{ K}$ Substituting the values into the formula: $\Delta S = \frac{2930\text{ J/mol}}{300\text{ K}} = 9.766\text{ J/mol K} \approx 9.77\text{ J/mol K}$