How much heat will be released during solidification and cooling of aluminum weighing 1.5 tons

univerkov | December 5, 2020 | education

How much heat will be released during solidification and cooling of aluminum weighing 1.5 tons from the melting point to 200 degrees Celsius.

Given: m = 1500kg tm = 650 ° C t = 200 ° L = 380000J / kg c = 890J / kg * ° C
Find: Q-?
Solution: Q1 = -L * m (when solidifying aluminum) Q2 = c * m * (t-tp) => Q = Q1 + Q2 = -L * m + c * m * (t-tp) = – m ( L + s (tp-t)) = – 1500 (380000 + 890 (660-200)) = -1.2gJ (- indicates that heat is released)
Answer: 1.2gJ

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