What amount of heat is released when mercury with a mass of 2 kg freezes, taken at a temperature of -39 C?
July 27, 2021 | education|
Initial data: m (mass of taken mercury) = 2 kg; t (initial temperature of mercury) = -39 ºС.
Reference values: according to the condition tmelt (melting point of mercury) = -39 ºС; λ (specific heat of fusion) = 0.12 * 10 ^ 5 J / kg.
The amount of thermal energy released during freezing of 2 kg of mercury is determined by the formula: Q = λ * m.
Calculation: Q = 0.12 * 10 ^ 5 * 2 = 0.24 * 10 ^ 5 J (24 kJ).
Answer: When 2 kilograms of mercury freeze, 24 kJ of heat should be released.
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