A 15.0-kg block of ice at 0.0oC melts to liquid water at 0.0oC inside a large room that has a temperature of 20.0oC. Treat the ice and the room as an isolated system, and assume that the room is large enough for its temperature change to he ignored.
(a) Is the melting of the ice reversible or irreversible? Explain, using simple physical reasoning without resorting to any equations.
(b) Calculate the net entropy change of the system during this process. Explain whether or not this result is consistent with your answer to part (a).