What amount of heat will be released during the crystallization of 4 kg of copper and its cooling to a temperature of 585C.

The amount of heat released during the crystallization and cooling of copper is calculated by the formula: Q = Q1 (copper crystallization) + Q2 (copper cooling) = λ * m + C * m * (tcr – t) = m * (λ + C * (tcr – t)), where m is the mass of taken copper (4 kg); λ – specific heat of fusion (21 * 10 ^ 4 J / kg); C – specific heat (400 J / (kg * K)); tcr – crystallization temperature (1085 ºС); t (temperature to which copper cools down) = 585 ºС.

Calculation: Q = 4 * (21 * 10 ^ 4 + 400 * (1085 – 585)) = 1 640 000 J (1.64 MJ).