# How to calculate Volatile Molecular Weight in Coal Combustion?

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 November 22, 2011, 14:55 How to calculate Volatile Molecular Weight in Coal Combustion? #1 Member   Mosi Owa Join Date: Nov 2011 Posts: 35 Rep Power: 6 Hi All, I am trying to model pure coal combustion in Fluent but I do not know how to calculate Volatile Molecular Weight (Kg/Kmol) using Proximate and Ultimate Analysis. I can calculate mass fraction of C, H, O and N in volatile but I do not know how to use them to get x,y,z and w in CxHyOzNw. Do you have any idea to help me out? Thanks

 December 13, 2011, 01:32 #2 Member   Join Date: Mar 2009 Posts: 39 Rep Power: 9 Hi, Molecular Weight of compound can be computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

December 26, 2011, 15:19
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Mosi Owa
Join Date: Nov 2011
Posts: 35
Rep Power: 6
Quote:
 Originally Posted by mehulkumar Hi, Molecular Weight of compound can be computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
Thanks, but the problem is that I do not know the chemical formula and I'm looking for a way to find it. Let me clarify my case: I have 35.61 gr of volatile which is composes of C, H, N, O and S. I know the fraction of each substance as 20.22 gr of C, 4.77 gr of H, 1.54 gr of N, 7.78 gr of O and 1.3 gr of S. Now, I want to know the molecular weight of my volatile or in other word the coefficients of CxHyNpOqSr. Any idea?

 December 27, 2011, 00:08 Calculation of Volatile Molarmass #4 Member   Join Date: Mar 2009 Posts: 39 Rep Power: 9 Hi, You may get hint from this link: https://www.sharcnet.ca/Software/Flu...oal_inputs_pdf Mehulkumar

 Tags coal combustion, volatile

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