Question

One kilogram of water at 5˚C is heated to 100˚C. Compute its change in entropy. Assume that the specific heat of water is constant at 4190 J/kg·K over this temperature range

Answer 1

The change in entropy is

$$ΔS=2.303nC_P\log\frac{T_2}{T_1},\\\space\\ ΔS=2.303\frac m{\Mu}C_P\log\frac{T_2}{T_1},\\\space\\=68.4\text{ kJ}.$$