A 406.0-kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300K. How much heat must the smelter produce to completely melt the copper bar? (The specific heat for copper is 386J/kgK, the heat of fusion for copper is 205kJ/kg and its melting point is 1357K. a. 2.96 × 105 kJ b. 2.49 × 105 kJ c. 1.66 × 108 kJ d. 1.66 × 1011 kJ
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Energy required to heat the copper to melting point: 406.0 kg * (1357 J - 300 J) * 386 J/kgK 165648812 J Energy required to melt the copper: 406.0 kg * 205000 J/kg 83230000 J Total energy required: 165648812 J + 83230000 J 248878812 J 248878 kJ 2.49 * 10^5 kJ Therefore, the answer is (b)
