Task data: m (mass of molten substance) = 15 kg; the specified substance was at the melting point; Q (required heat) = 1800 kJ (1800 * 10 ^ 3 J).
To determine the specific heat of fusion of a given substance, we will use the formula: q = Q / m.
Let’s calculate: q = 1800 * 10 ^ 3/15 = 120 * 10 ^ 3 J / kg = 120 kJ / kg.
Answer: The given substance has a specific heat of fusion of 120 kJ / kg.
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.