How much heat must be spent to melt a piece of ice with a mass of 2 kg, taken at the melting temperature?

The amount of heat that goes to melt a piece of ice can be calculated using the formula:
Q = λ * m, where λ is the specific heat of melting of ice (λ = 3.4 * 10 ^ 5 J / kg), m is the mass of a piece of ice (m = 2 kg).
Let’s calculate the required amount of heat:
Q = λ * m = (3.4 * 10 ^ 5) * 2 = 6.8 * 10 ^ 5 J = 0.68 MJ.
Answer: It is necessary to spend 0.68 MJ of heat.