How much heat is required to melt 10 kg of iron. taken at a temperature of 39 degrees C?

univerkov | September 22, 2021 | education

To find the costs of heat for melting the taken iron, we will use the formula: Q = Czh * m * (tmelt – t0) + λ * m = (Czh * (tmelt – t0) + λ) * m.

Constants and variables: Szh – specific heat of iron (Szh = 460 J / (kg * K)); tmelt – melting point (tmelt = 1539 ºС); t0 – iron temperature before heating (t0 = 39 ºС); λ – specific heat of fusion (λ = 2.7 * 10 ^ 5 J / kg); m is the mass of iron taken (m = 10 kg).

Calculation: Q = (460 * (1539 – 36) + 2.7 * 10 ^ 5) * 10 = 9.6 * 10 ^ 6 J = 9.6 MJ.

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