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Clausius-Clapeyron Lab Analysis

Here are the equations



For the lab we use

to find the DHvap of a liquid.

Looking at the equation you should notice the Y=MX+ B  format.


M=slope= -DHvap/R


B=C which we don't worry about

By making a  plot of lnP  vs. 1/T we should get a strait line

The slope of this line times -R will give us the Heat of vaporization.


Here is a plot of vapor pressure vs. Temp

Not a straight line

The plot of Ln ofvapor pressure vs. 1/ Temp

A nice straight line. Find the slope of this line and calculate the DHvap.

slope= -DHvap/R

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