How much energy is needed to melt 100 kg of iron taken at the melting temperature.

To find the thermal energy expended for smelting 100 kg of iron, we will use the formula (we take into account that iron is at the melting temperature): Q = λ * m.

Values of variables and constants: λ – specific heat of fusion of iron (λ = 2.7 * 10 ^ 5 J / kg); m is the mass of iron taken (m = 100 kg).

Let’s perform the calculation: Q = λ * m = 2.7 * 10 ^ 5 * 100 = 27 * 10 ^ 6 J = 27 MJ.

Answer: To melt 100 kg of taken iron, 27 MJ of thermal energy is needed.