1. Tardigrade
  2. Question
  3. Physics
  4. Determine the change in entropy ΔS (in SI unit) of 100gm of water when it is heated to the boiling point from room temperature of T=300K , and it is transformed into vapour at the boiling temperature and atmospheric pressure. It is given that for water: the molar heat capacity C=75.4J/(mol - K) ; latent heat of vaporization :L=2.26MJ/kg [Take ln(1 .24)=0.217 ]

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Q. Determine the change in entropy $ΔS$ (in SI unit) of $100gm$ of water when it is heated to the boiling point from room temperature of $T=300K$ , and it is transformed into vapour at the boiling temperature and atmospheric pressure. It is given that for water: the molar heat capacity $C=75.4J/\left(mol - K\right)$ ; latent heat of vaporization $:L=2.26MJ/kg$
[Take $ln\left(1 .24\right)=0.217$ ]

NTA AbhyasNTA Abhyas 2022

Solution:

$\Delta S=nCln\left(\frac{T_{b}}{T}\right)+\frac{m L}{T_{b}}=697JK^{- 1}$