lbmol to kmol

Questions and answers on how to convert things from one unit or system to another
Forum rules
Dear convert-me.com forum visitors,

Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.

All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page

Thank you for being with us and sorry for any inconveniences this could caused.

lbmol to kmol

Postby droopy » Wed Apr 21, 2004 11:38 pm

How do I convert lbmol to kmol ???
droopy
 

Re: lbmol to kmol

Postby Knight » Tue May 11, 2004 9:31 pm

droopy wrote:How do I convert lbmol to kmol ???

Ah... Working with the Ideal Gas Law, Are we?

A mol (sometimes gmol, g-mol, or mole, not to be confused with the rodent) denotes an amount of matter. Specifically one mol is 6.0251 x 10^23 molecules of a substance, a standard number of molecules known as Avogadro’s number. Strictly speaking, mol does not have dimensions of mass; rather, mol is a primary dimension in and of itself, i.e. the amount of matter. The number of mols of a substance is denoted by the letter n. Molecular weight (M) is defined as the number of grams (g) per mol of a substance. M is obtained from standard periodic charts of the elements. For example, the molecular weight of nitrogen is M(nitrogen) = 14.0067 g/mol. Nitrogen in its gaseous or vapor state occurs as a diatomic molecule, N2; thus, M(gaseous nitrogen) = 28.0134 g/mol. Since air is made up predominantly of nitrogen gas, the molecular weight of air is very close to that of nitrogen, i.e. M(air) = 28.97 g/mol.

In S.I. units, the kilogram (kg) is preferred over the gram; thus the kilogram-mol (kmol, sometimes kg-mol or kg-mole) is often used instead of the mol. By definition, a kmol is defined as 1000 mol, or 6.0251 x 10^26 molecules of the substance. The molecular weight of air in terms of kg and kmol is then:


Code: Select all
         28.97 g   1000 mol     kg            kg
M(air) = ------- x -------- x ------ = 28.97 ----
           mol       kmol     1000 g         kmol



In English units, the pound-mass (lbm) is the standard unit of mass. In order to use the same molecular weights as those listed on the periodic chart, the pound-mol, (lbmol, sometimes lb-mol, lbm-mol, or lbm-mole) is defined. The molecular weight of elemental nitrogen, for example, in English units is M(nitrogen) = 14.0067 lbm/lbmol, and the molecular weight of air is:

M(air) = 28.97 lbm/lbmol.
Last edited by Knight on Tue Mar 22, 2005 4:04 am, edited 1 time in total.
Knight
Expert
 
Posts: 309
Joined: Tue Jan 13, 2004 9:43 pm
Location: Los Alamos, NM

oh!

Postby gotIt » Mon Mar 21, 2005 1:11 am

Ah, thank you; I was confused on that too.

One note, though: there's one typo in there that threw me for a second until I realized it was actually a typo; you have "29.97 kg/kmol" instead of "28.97".
gotIt
 

Re: oh!

Postby Knight » Tue Mar 22, 2005 4:05 am

gotIt wrote:Ah, thank you; I was confused on that too.

One note, though: there's one typo in there that threw me for a second until I realized it was actually a typo; you have "29.97 kg/kmol" instead of "28.97".
Good catch. I've corrected the original
Knight
Expert
 
Posts: 309
Joined: Tue Jan 13, 2004 9:43 pm
Location: Los Alamos, NM


More info

  • List of all units you can convert online
  • Metric conversion
  • Convert pounds to gallons
  • Convert grams to cups
  • Grams to milliliters
  • Imperial vs US Customary
  • History of measurement
  • Return to How to convert?



    Our Privacy Policy       Cooking Measures Converter       Metric conversions

    cron