What is the minimum amount of energy required to completely melt a 7.25-kg lead brick which has a starting temperature of 18.0 C? The melting point of lead is 328 C. The specific heat capacity of lead is 128 J/(kg C); and its latent heat of fusion is 23,200 J/kg. .. What is the entropy change of the lead during this process? . If the lead is heated in a furnace at temperature 750C, what is the entropy change of the furnace? 1. What is the total entropy change in this process?