To calculate the amount of heat needed to melt the ice, we can use the formula:q = n * Hfwhere q is the heat required, n is the number of moles of the substance, and Hf is the enthalpy of fusion.First, we need to find the number of moles n of ice. The molar mass of water H2O is approximately 18.015 g/mol. n = mass / molar massn = 25 g / 18.015 g/moln 1.387 molesNow, we can calculate the heat required q using the enthalpy of fusion Hf :q = n * Hfq = 1.387 moles * 6.02 kJ/molq 8.35 kJTherefore, the amount of heat needed to melt 25 grams of ice at its melting point is approximately 8.35 kJ.