Entalpy of vaporization of water is 41.1k/mol. if the vapor pressure of water at 373k is 101.3 kpa, what is the vapor pressure of water at 298k?

The vapor pressure of water at 298 K is 3.565kPa.

Explanation:

The vapor pressure is determined by Clausius Clapeyron equation:

where,

= initial pressure at 298 K = ?

= final pressure at 373 K = 101.3 kPa

= enthalpy of vaporisation = 41.1 kJ/mol = 41100 J/mol

R = gas constant = 8.314 J/mole.K

= initial temperature = 298 K

= final temperature = 373 K

Now put all the given values in this formula, we get

Therefore, the vapor pressure of water at 298 K is 3.565kPa.

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