A zinc ingot weighing 2.5 kg was straightened at 420 degrees. How much heat is transferred to zinc? Has his inner energy changed?

univerkov | January 13, 2021 | education

Problem data: m (mass of taken zinc ingot) = 2.5 kg; t (temperature at which the zinc ingot was located) = 420 ºС (corresponds to the melting point of zinc).
Reference values: λ (specific heat of fusion of zinc) = 117 * 10 ^ 3 J / kg.
The amount of heat transferred to zinc is calculated by the formula: Q = λ * m.
Calculation: Q = 117 * 10 ^ 3 * 2.5 = 292.5 * 10 ^ 3 J (292.5 kJ); the internal energy of zinc increased by 292.5 kJ.
Answer: During melting, zinc was transferred 292.5 kJ of heat.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.