Find the change in entropy of the system during the following processes:
a.) 1 kg of water is heated reversibly by an electric heating coil from 20 degrees Celsius to 80 degrees Celsius (Cp = 1 cal g^-1 C^-1 = 4.18 x 10^3 J kg^-1 K^-1)
b.) 1 kg of ice at 0 degrees Celsius and 1 atm pressure melts at the same temperature and pressure. (The latent heat of fusion is 3.34 x 10^5 J kg^-1)
c.) 1 kg of steam at 100 degrees Celsius and 1 atm pressure condenses to water at the same temperature and pressure. (The latent heat of vaporization is 2.26 x 10^6 J kg^-1)