Posted by **Angel** on Sunday, February 26, 2012 at 6:47pm.

If you can show me an example of one problem, I have no idea how to approach this.

Calculate where the number 40.67 came from.

Use the Clapeyron-Clausisus equation. Assuming that delta H vap does not change with temperature, this equation relates the change in vapor pressure and temperature to a substance's enthalpy of vaporization (R is the molar mass constant). Use this relationship and the fact that delta H vap of water at 25 degrees Celsius is 43.99 kJ/mol to calculate the vapor pressure of water at 5,25,50, and 95 degrees Celsius. Your results should be (in order and in Torr)

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