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Phase Transformations

Problem 2.213

Water of mass m=1.00 kgm=1.00 \mathrm{~kg} is heated from the temperature t1=10∘Ct_{1}=10{ }^{\circ} \mathrm{C} up to t2=100∘Ct_{2}=100{ }^{\circ} \mathrm{C} at which it evaporates completely Find the entropy increment of the system.

Reveal Answer
ΔS≈m[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}
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