1 reply to this topic

[ali786]

Hi,

In order to condense the following mixture, i need to calculate the dew point of the mixture. I have written the MOLE PERCENT (composition) of each component. How can i compute the DEW POINT of the mixture.The mixture is at 1 bar pressure and 120 C...

COMPONENT MOLE PERCENT

H2O 92%

NO2 3.96%

NO 1.7%

CO2 (non-condensible) 2.3%

[Art Montemayor]

Ali:

The best way I can help you is not to give you answer, but rather to tell you:

1. What you failed to do.

You failed to fill in all of your personal profile. Without knowing where you are from (or at), what year of university engineering courses you find yourself in, and what is your specific assignment (is it homework or engineering curiosity), I can't help you in detail.

You failed to use your own initiative inspite of having the use of a personal computer. You are either a lazy student or a student who has just started out yesterday to use a PC. All I had to do was to copy "dew point of the mixture" from your posting and paste it in the Google Search Engine and I got an immediate calculated answer at http://www.questcons...jrm/dewbub.html.

2. What you did wrong.

You failed to tell us whether the pressure of 1 bar is gauge or absolute. I had to assume it is absolute.

You also failed to give a complete analysis of the vapor mixture. Your components add up to 99.96% and should add up to 100.00%. I added 0.04 to the CO₂ in order to complete the analysis.

3. Your answer is:

Calculating dew point pressure at 120.0 degrees Kelvin.
The dew point pressure is 0.0 kPa absolute.
Calculating bubble point pressure at 120.0 degrees Kelvin
The bubble point pressure is 188627.8 kPa absolute.
Calculating dew point temperature at 100.0 kPa absolute.
The dew point temperature is 371.9 degrees Kelvin.
Calculating bubble point temperature at 100.0 kPa absolute.
The bubble point temperature is 1.1 degrees Kelvin.

The above answer is not important. It is only the computer printout of a math calculation. The important thing for you to learn is the definition of the Dew Point and having the ability to calculate it manually - regardless of how accurate it comes out. Since you failed to state your personal profile, I can't guess what grade you are in or what level of studies you have taken; therefore, I can't offer any further comments other than the above.

If you continue to exhibit laziness as a Chemical Engineering student, you will never succeed as a professional - if you make it that far.

Best of Luck.