3.1(a) Calculate the change in entropy when 25 kJ of energy is transferred
reversibly and isothermally as heat to a large block of iron at (a) 0°C,
(b) 100°C.
3.1(b) Calculate the change in entropy when 50 kJ of energy is transferred
reversibly and isothermally as heat to a large block of copper at (a) 0°C,
(b) 70°C.