Find the amount of heat required to melt 3 kilograms of ice at 0 degrees.

m = 3 kg.
λ = 330,000 J / kg.
Q -?
The amount of heat Q, which is necessary for melting a substance at the melting point is determined by the formula: Q = λ * m. Where λ is the specific heat of fusion, m is the mass of the substance that melts.
Q = 330,000 J / kg * 3 kg = 990,000 J = 990 kJ.
Answer: to melt 3 kg of ice, you need Q = 990 kJ of the amount of heat.