How much heat must be spent to melt a 3 kg lead ingot heated to a temperature of 327 ° C?
| January 29, 2021 | education
Initial data: m (mass of the lead ingot to be melted) = 3 kg; t (temperature to which the ingot was heated) = 327 ºС (melting point).
Reference values: λ (specific heat of fusion of lead) = 25 kJ / kg = 25 * 10 ^ 3 J / kg.
The amount of heat that will be spent on melting the ingot is determined by the formula: Q = λ * m.
Calculation: Q = 25 * 10 ^ 3 * 3 = 75 * 10 ^ 3 J (75 kJ).
Answer: It is necessary to spend 75 kJ of heat.
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