The Clausius-Clapeyron Equation for Pressure calculator estimates the vapor pressure of a liquid at a certain temperature when the vapor pressure at another temperature is known.
INSTRUCTIONS: Choose units and enter the following:
Pressure (P2): The calculator returns the vapor pressure at temperature T2 in atmospheres. However, the pressure can be automatically converted to other pressure units (.e.g., pascals) via the pull-down menu.
The Clausius-Clapeyron Equation is as follows:
`ln((P_1)/(P_2)) = -(DeltaH_(vap))/R * (1/T_1 - 1/T_2)`
where R is the ideal gas constant (8.314 J/mol*K)
This calculator solves the above equation for P2. Therefore, the Clausius-Clapeyron equation for final pressure is:
`P_2 = P_1 * e^((DeltaH_"vap")/R (1/T_1 - 1/T_2))`
UCDavis ChemWiki: Clausius-Clapeyron Equation
YouTube: Find the Vapour Pressure (Clausius-Clapeyron Equation)
Whitten, et al. "Chemistry" 10th Edition. Pp. 467