1.0 kg of steam at 100°C condenses to water at 100°C. What is the change in entropy in the process?

Question

Quizplus · Accepted Answer

The change in entropy (ΔS) during condensation is calculated using ΔS = -mL/T, where m is the mass, L is the latent heat of vaporization (2260 J/g for water), and T is the temperature in Kelvin (373 K for 100°C). For 1 kg (1000 g) of steam, ΔS = -(1000 g)(2260 J/g) / 373 K = -6.1 × 10^3 J/K.

10 Kg of Steam at 100°C Condenses to Water at 100°C