Before we get into calculations dealing with the Clausius-Clapeyron equation, it's important to understand that the equation itself establishes the relationship between vapor pressure of liquids and temperature itself.
Now recall vapor pressure represents an equilibrium between condensation where a gas goes down into a liquid and vaporization which is the opposite where a liquid is converted into a gas. And one important piece of information is that as our temperature increases, our vapor pressure will also increase.
The Clausius-Clapeyron equation is just a way of us looking at this change in vapor pressure as temperature increases or vice versa. So keep this in mind as we start to look at the different forms of the Clausius-Clapeyron equation and the calculations that are related to it.