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

To calculate how much heat should be obtained by iron, taken at the melting temperature for the transition to a liquid state, we use the formula Q = λ • m, where the mass of iron is m = 100 kg, the specific heat of fusion of iron λ = 0.27 MJ / kg. Substitute the values of physical quantities in the formula and make calculations: Q = 100 kg • 270,000 J / kg = 27,000,000 J = 27 MJ.
Answer: the amount of heat required to convert a given mass of iron into a liquid state is Q = 27 MJ.