Determine the energy required to liquidate 100 kg of iron taken at the melting point.

Initial data: m (mass of iron to be converted into liquid) = 100 kg.

Reference data: according to the condition λ (specific heat of fusion of iron) = 2.7 * 10 ^ 5 J / kg.

The thermal energy, which is necessary for the transformation of iron into liquid, is determined by the formula: Q = λ * m.

Let’s perform the calculation: Q = 2.7 * 10 ^ 5 * 100 = 2.7 * 10 ^ 7 J.

Answer: To convert 100 kg of iron into a liquid, 2.7 * 10 ^ 7 J of energy is needed.

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