Initial data: m (mass of crystallizing iron) = 0.5 t; t0 (iron temperature, corresponds to the melting point) = 1539 ºС.
Reference data: L (specific heat of fusion of iron) = 270 * 10 ^ 3 J / kg.
SI system: m = 0.5 t = 0.5 * 1000 kg = 500 kg.
The amount of energy that will be released during the hardening of iron is determined by the formula: Q = L * m.
Let’s perform the calculation: Q = 270 * 10 ^ 3 * 500 = 135,000,000 J = 135 * 10 ^ 6 J = 135 MJ.
Answer: When 0.5 ton of iron solidifies, 135 MJ of energy will be released.
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