How much heat needs to be spent to melt 2 kg of silver taken at the melting temperature.

Initial data: m (mass of silver for melting) = 2 kg, silver is taken at the melting point.

Constants: λ (specific heat of fusion of silver) = 87 kJ = 87 * 10 ^ 3 J / kg.

The consumed amount of heat for melting 2 kg of silver can be determined by the formula: Q = λ * m.

Let’s calculate: Q = 87 * 10 ^ 3 * 2 = 174 * 10 ^ 3 J = 174 kJ.

Answer: To melt 2 kg of silver, you need to spend 174 kJ of heat.