Question

Calculate the standard enthalpy change for the phase transition of water from liquid to ice at 0°C, given the following information: The molar heat capacity of liquid water, Cp = 75.3 J/mol K The molar heat capacity of ice, Cp = 36.6 J/mol K The enthalpy of fusion, ΔHfus = 6.01 kJ/mol

Answer 1

To calculate the standard enthalpy change for the phase transition of water from liquid to ice at 0C, we can use the following equation:H = Hfus + Cp * Twhere H is the standard enthalpy change, Hfus is the enthalpy of fusion, Cp is the difference in molar heat capacities between the two phases, and T is the temperature change.In this case, the temperature change  T  is 0C since we are considering the phase transition at 0C. Therefore, the equation becomes:H = Hfus + Cp * 0H = HfusSince the enthalpy of fusion  Hfus  is given as 6.01 kJ/mol, the standard enthalpy change for the phase transition of water from liquid to ice at 0C is:H = 6.01 kJ/mol