Question

1 gram of ice at l00degrees melts how much of ice at 0 degrees

Answer 1

The process of ice melting at a temperature of 273.15 K is at equilibrium, i.e., its DeltaG value must be equal to zero. Therefore, no work is needed for melting at this temperature. But energy in the form of heat has to be delivered reversibly to the system, to keep the temperature at 273.15 K. This heat energy is taken up by the produced liquid water, which has a lower content energy than the corresponding amount of solid water. For an extent of reaction of 1.0 mol, 6.008 kJ/mol of heat energy are consumed. This is the enthalpy of fusion DeltaHfus.

Thus, for the melting of 1.0 g of ice, 1/18.015 *6.008 = 0.05551 kJ of heat energy are consumed without doing work.