What amount of energy will be released during crystallization of 200 g of tin taken at a temperature of 1500 degrees C.

univerkov | February 24, 2021 | education

Data: m (weight of gold) = 200 g = 0.2 kg; t0 (initial temperature of gold) = 1500 ºС (gold is in a liquid state).

Reference values: tк (crystallization temperature) = 1064.4 ºС; С (specific heat of gold, for the temperature range 1064.4 … 1500 ºС) ≈ 155 J / (kg * K); λ (specific heat of crystallization of gold) = 66.2 * 10 ^ 3 J / kg.

Amount of energy: Q = Q1 (cooling) + Q2 (crystallization) = C * m * (t0 – tc) + λ * m = 155 * 0.2 * (1500 – 1064.4) + 66.2 * 10 ^ 3 * 0.2 = 26,743.2 J.

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