What amount of heat will be released during the crystallization of zinc weighing 5 kg, having a temperature of 520 ° C.

To find out the heat obtained due to the crystallization of taken zinc, consider the formula: Qx = m * (Cc * (t – tcr) + λ), where m is the mass of taken zinc (m = 5 kg); SC – beats. heat capacity of zinc (SC = 385 J / (kg * K)); t is the initial zinc temperature (t = 520 ºС); tcr – temperature of the beginning of crystallization (tcr = 419.6 ºС); λ – beats heat of crystallization (λ = 117 * 10 ^ 3 J / kg).

Let’s perform the calculation: Qx = m * (SC * (t – tcr) + λ) = 5 * (385 * (520 – 419.6) + 117 * 10 ^ 3) = 778270 J ≈ 778 kJ.

Answer: Due to crystallization of 5 kg of zinc, 778 kJ of heat will be released.