[QUE/TH-07009] TH-PROBLEM

Ten grams of water at 20$^\circ$C is converted into ice at
-10$^\circ$C at constant atmospheric pressure. Assuming the heat
capacity per gram of liquid water to remain constant at 4.2 J/g\,K,
and that of ice to be one half of this value, and taking the heat of
fusion of ice at 0$^\circ$C to be 335 J/g, calculate the total
entropy change of the system.