How much heat is needed to melt 0.2 kg. of tin taken at a temperature of 32 ° C?
| May 8, 2021 | education
Given: m (mass of tin to be melted) = 0.2 kg; t0 (initial temperature) = 32 ºС.
Constants: Cо (specific heat capacity of tin) = 230 J / (kg * ºС); tmelt (temperature of the beginning of melting) = 231.9 ºС ≈ 232 ºС; λ (specific heat of fusion of tin) = 0.59 * 10 ^ 5 J / kg.
The required heat for melting 0.2 kg of tin: Q = Q1 + Q2 = Co * m * (tmelt – t0) + λ * m.
Calculation: Q = 230 * 0.2 * (232 – 32) + 0.59 * 10 ^ 5 * 0.2 = 21 * 10 ^ 3 J (21 kJ).
Answer: To melt 0.2 kg of tin, 21 kJ of heat is required.
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