A34.1-kg mass of copper is melted to be cast into a graphite mold at a copper pipe foundry. if the solid copper starts off at the normal melting temperature of copper and the liquid copper is put into the mold at the crystallization point of copper, how much heat is added to melt the copper?

Explanation:

It is known that heat of fusion of copper is equal to 207 kJ/kg. Also, it is known that relation between heat energy and specific heat is as follows.

                   Q =

where,      Q = heat energy

                 m = mass

            = heat of fusion

Hence, putting the given values into the above formula to calculate heat energy as follows.

                Q =

                    =

                    = 7058.7 kJ

Thus, we can conclude that 7058.7 kJ heat is added to melt the copper.