Help Finding molar flow rate of product out of a condenser

In summary, the problem involves a gas stream with 18.0 mole% hexane and the remaining nitrogen, flowing to a condenser where the temperature is reduced and some of the hexane is liquefied. The question is to find the flow rate of the gas stream leaving the condenser in mol/min. To solve this, an assumption must be made (either constant total flow rate or constant total pressure) and using the given data and a mass balance equation, the flow rate out can be found.
  • #1
ChemE_undergrad
3
0
Ok. I have attempted this problem several times and went about it a couple of different ways and still cannot get a viable answer!

the problem is:

A gas stream contains 18.0 mole% hexane (C6H14) and the remainder nitrogen. The stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. The hexane mole fraction in the gas stream leaving the condenser is 0.0500. Liquid hexane condensate is recovered at a rate of 1.50 L/min.

see attached *.doc file for a diagram relating to the problem!
 

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  • #2
oh, sorry. The question is: What is the flow rate of the gas stream leaving the condenser in mol/min?

Note: I have always begun by finding the molar flow rate of the condensate.
 
  • #3
You'll have to make at least one assumption along the way: either you work with constant total flow rate, or with constant total pressure (or something else). With the first assumption, you can write down the ratio of flow rate out to flow rate in from the given data. The second equation is just a mass balance relation. The two equations can be solved for the two unknowns.
 
  • #4
awesome! thanks, a lot.
 

1. How do you calculate the molar flow rate of product out of a condenser?

To calculate the molar flow rate of product out of a condenser, you need to know the total molar flow rate of the reactants and the extent of reaction. The molar flow rate of the product is equal to the total molar flow rate multiplied by the extent of reaction.

2. What is a condenser and what is its role in determining molar flow rate?

A condenser is a device used to convert vapor or gas into liquid. In the context of determining molar flow rate, a condenser is used to remove the product from the reaction mixture and measure its molar flow rate.

3. How does temperature and pressure affect the molar flow rate of product from a condenser?

Temperature and pressure can affect the molar flow rate of product from a condenser as they can change the physical state of the product. Higher temperatures can increase the vapor pressure of the product, while higher pressures can increase the solubility of the product in the liquid phase.

4. What are the units for molar flow rate of product out of a condenser?

The units for molar flow rate of product out of a condenser are moles per unit time, typically represented as mol/s or mol/min.

5. Are there any other factors that can influence the molar flow rate of product from a condenser?

Yes, there are other factors that can influence the molar flow rate of product from a condenser. These include the design and efficiency of the condenser, the composition of the reaction mixture, and potential side reactions that may occur during the reaction.

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