How much heat is needed to melt 5 kg of iron already heated to its melting point?

univerkov | February 23, 2021 | education

Given: m (mass of iron to be melted) = 5 kg; taken iron is heated to the melting point (t = 1539 ºC).

Constants: λ (specific heat of fusion of iron) = 2.7 * 10 ^ 5 J / kg.

The heat that is needed to melt 5 kg of iron is calculated by the formula: Q = λ * m.

Let’s do the calculation: Q = 2.7 * 10 ^ 5 * 5 = 1.35 * 10 ^ 6 J or 1.35 MJ.

Answer: To melt 5 kg of iron, you need 1.35 MJ of heat.

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