Calculate the entropy change corresponding to the process of vaporization of 1 mol of liquid water at 0°C and 1 atm into

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Calculate the entropy change corresponding to the process of
vaporization of 1 mol of liquid water at 0°C and 1 atm into steam
at 100°C if the process is carried out
a) irreversibly by the following path: 0°C, 1 atm water → 100°C,
1 atm water → 100°C, 1 atm steam
b) reversibly by the following path: 0°C, 1 atm water →0°C,
Pb water →0°C, Pb steam →100°C,
Pb steam →100°C, 1 atm steam
(∆vapHm,373K=40,67 kJ/mol; ∆vapHm,273K=44,92 kJ/mol; vapor
pressure of water at 0oC is Pvap=4,58 mmHg; Cp,m,water=75,5
J/mol.K; Cp,m,steam=33,8 J/mol.K)