CHemistry Help???

Question

If Pvap (H2O) is 760 torr at 100.oC and Pvap (H2O) is 400

torr at 83.0 oC what is the ΔHvap for H2O liquid? 

 

Answer 1

Step 1 :

The vapor pressure of is at .

The vapor pressure of is at .

Let us use the Clausius-Clapeyron Equation:

Where are vapor pressures.

            are temperatures.

Step 2 :

Substitute torr, , torr, ,

and in Clausius-Clapeyron Equation .

The heat vaporization of is .

Solution :

The heat vaporization of is .