A 50 kg cast iron block at 500 K (226.85 deg C) is thrown into a large lake that is at a temp of 285 K. The iron block eventually reaches thermal equilibrium with the lake water. Assuming an average specific heat of 0.45 kJ/(kg-K) for the iron, determine:
(a) The entropy change of the iron block?
(b) The entropy change of the lake water?
(c) The entropy generated during this process?