Is there a value for the enthalpy of vaporization of water at any temperature? Or does the value change with different temperatures? And if there is just one value, do you know what it is?

No, the enthalpy changes with temperature. At the boiling point of water, the heat of vaporization is 540 calories/gram or 2260 Joules/g. At body temperature (about 37 degrees C), the heat of vaporization is 2410 J/g. I don't know it at other temperatures but the net probably will have it if you try google.

Thanks for the help. Sorry for the triple post. You might want to change having the site say press ctrl+d to save the page to check your answer as I did that and it lead me back to the posting page every time.

The enthalpy of vaporization of water does change with different temperatures. Enthalpy of vaporization refers to the amount of energy required to change a substance from its liquid phase to its gaseous phase at a given temperature. In the case of water, this value is not constant.

The enthalpy of vaporization of water is influenced greatly by temperature. As the temperature increases, the amount of energy needed to vaporize water also increases. This occurs because at higher temperatures, the water molecules have more kinetic energy and are moving more rapidly, making it more difficult to break the intermolecular forces that hold the liquid together.

To find the specific value of the enthalpy of vaporization of water at a particular temperature, you can consult reference sources like scientific literature, handbooks, or online databases. These sources often provide tables or equations that represent the temperature dependence of the enthalpy of vaporization for various substances, including water.

To illustrate the changing values, here are a few examples of the enthalpy of vaporization of water at different temperatures:

- At 100°C (boiling point of water at standard atmospheric pressure), the enthalpy of vaporization is approximately 40.7 kJ/mol.
- At 25°C (room temperature), the enthalpy of vaporization is about 40.7 kJ/mol.
- At 0°C (freezing point of water at standard atmospheric pressure), the enthalpy of vaporization is around 40.7 kJ/mol as well.

Please note that these values are approximate and might vary slightly depending on the specific experimental conditions and the reference source you consult.