To calculate the amount of heat required to melt 25 grams of ice at 0C, we will use the following equation:q = n * Hfwhere q is the heat required, n is the number of moles of ice, and Hf is the enthalpy of fusion of ice.First, we need to find the number of moles of ice. The molar mass of water H2O is 18.015 g/mol. n = mass / molar massn = 25 g / 18.015 g/moln 1.387 molesNow, we can calculate the heat required:q = n * Hfq = 1.387 moles * 6.01 kJ/molq 8.34 kJTherefore, the amount of heat required to melt 25 grams of ice at 0C is approximately 8.34 kJ.