All Problems

Phase Transformations

Problem 2.213

Water of mass \(m=1.00 \mathrm{~kg}\) is heated from the temperature \(t_{1}=10{ }^{\circ} \mathrm{C}\) up to \(t_{2}=100{ }^{\circ} \mathrm{C}\) at which it evaporates completely Find the entropy increment of the system.

Reveal Answer
ΔSm[cln(T2/T1)+q/T2]=7.2 kJ/K\Delta S \approx m\left[c \ln \left(T_{2} / T_{1}\right)+q / T_{2}\right]=7.2 \mathrm{~kJ} / \mathrm{K}