The vapour pressure of water at 20 c is 2.34 kpa. given that the heat of vaporisation is 2537.4 kj/kg, use the clausius-clapeyron equation to give the vapour pressure at 40 c.

Explanation:

The given data is as follows.

        = 2.34 kPa = 2.34 \times 1000 Pa = 2340 Pa = 0.0231 atm

  = (20 + 273) K = 293 K

  = 2537.4 kJ/kg = 2537400 J/kg

          = ?,         = (40 + 273) K = 313 K

According to Clausius-Clapeyron equation,

              =

                                =        

                                 = atm

or,                             = 18846.45 kPa

Thus, we can conclude that the vapor pressure at is 18846.45 kPa.

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the right answer is c i just did the question.