To calculate the enthalpy change for the fusion of 50.0 g of ice, we first need to determine the number of moles of ice. The molar mass of water H2O is 18.015 g/mol.Number of moles = mass / molar massNumber of moles = 50.0 g / 18.015 g/mol = 2.776 molesNow, we can use the molar enthalpy of fusion to calculate the enthalpy change.Enthalpy change = number of moles molar enthalpy of fusionEnthalpy change = 2.776 moles 6.01 kJ/mol = 16.681 kJTherefore, the enthalpy change for the fusion of 50.0 g of ice at its melting point is 16.681 kJ.