Benzaldehyde, C6H5CHO}, has a normal boiling point of 179.0 C and a critical point at 422 C and 45.9 atm.
Using a phase diagram, estimate its vapor pressure at 125 Degrees
(I'm putting this back up again. Since I still didn't understand it but the answer to it was 171 torr.)
Without a phase diagram I can't help. But it should be just reading the vapor pressure from the graph.
To estimate the vapor pressure of benzaldehyde at 125 degrees Celsius using a phase diagram, you will need the critical temperature and pressure values as well as the normal boiling point.
1. Take note of the critical temperature and pressure: The critical temperature for benzaldehyde is given as 422 degrees Celsius, and the critical pressure is 45.9 atm.
2. Determine the normal boiling point: The normal boiling point of benzaldehyde is 179.0 degrees Celsius.
Now, let's start estimating the vapor pressure at 125 degrees Celsius:
3. Identify the relevant region on the phase diagram: In this case, we are interested in the liquid-vapor equilibrium region, specifically at 125 degrees Celsius.
4. Locate the point corresponding to 125 degrees Celsius on the phase diagram: Check the temperature scale on the phase diagram and find the corresponding point.
5. Draw a line horizontally from this point until it intersects the vapor pressure curve: Extend a horizontal line from the point at 125 degrees Celsius until it intersects with the vapor pressure curve.
6. Follow the vapor pressure curve to the pressure axis: Follow the line connecting the intersection point on the vapor pressure curve to the pressure axis.
7. Read the vapor pressure value: Once you reach the pressure axis, read the corresponding vapor pressure value. In this case, it is 171 torr.
Thus, using the phase diagram, the estimated vapor pressure of benzaldehyde at 125 degrees Celsius is approximately 171 torr.