Question

Which process requires more energy: completelyvaporizing 1 kg of saturated liquid water at 1 atm pressure orcompletely vaporizing 1 kg of saturated liquid water at 8 atmpressure?

Answer 1

The correct answer would be the first option. That means completely vaporizing 1 kg of saturated liquid water at 1 atm pressure would require more energy.

Enthalpy of Vaporization

The enthalpy of vaporization, also known as the heat of vaporization or heat of evaporation, is the quantity of energy that must be added to a liquid substance in order to transform a quantity of that substance into a gas.

The enthalpy of vaporization decreases as the pressure increases, so it takes more energy to completely vaporize 1 kg of saturated liquid water at 1 atm than at 8 atm.

What is the enthalpy of the vaporization of water?

The enthalpy of vaporization depends on the pressure at which that transformation occurs.

40.65 kJ/mol

The heat of vaporization value for water is 40.65 kJ/mol.

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