Question

Calculate the standard enthalpy change for the liquid-to-gas phase transition of water at 100°C and atmospheric pressure, given that the enthalpy of vaporization of water is 40.7 kJ/mol.

Answer 1

The standard enthalpy change for the liquid-to-gas phase transition of water at 100C and atmospheric pressure is simply the enthalpy of vaporization of water, which is given as 40.7 kJ/mol. So, the standard enthalpy change for this phase transition is 40.7 kJ/mol.