Question

Copper melts at 1085 °C. The specific heat of copper is 387 J/(kg· °C). The latent heat of fusion of copper is 20.7×104 J/kg. How much heat is needed to raise the temperature of 0.050 kg of copper from 23 °C to molten copper at 1085 °C?  

Answer 1

heat require to melt the copper = heat required to raise the temperature of solid copper from 23 degree to 1085 degree + absorption of latent heat of fusion

heat required =

=

= 0.05 * { (387*[1085-23]) + 207000)

= 0.05* [617994]

= 30899.7 Joules.

Therefore, heat required = 30899.7Joules

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