2 replies to this topic

[gregcc]

Hey guys, im trying to work out how much of a molecule is in a gram of an amino acid,for example glycine and alanine. I looked up the molecular mass of these amino acids and have found multiple measures for them. 

For example on this link it shows mass of amino acid residue, if i ordered amino acid powder such as l-glycine would those crystals be the residue?

http://www.matrixsci...p/aa_help.html 
I basicly just want to calculate how many glycine structures in a gram of l-glycine powder, not sure how to calculate it. 

 

Appreciate any help i can get on this.

 

[niner]

Yes, if you buy glycine powder, that will be the residue they call glycine.

 

I basicly just want to calculate how many glycine structures in a gram of l-glycine powder, not sure how to calculate it.

 

 

I'm not sure why you want to know how many molecules in a gram gly, but here's how you'd calculate it:

 

I gm glycine * (1 mol glycine / 57.02 gm) * (6.02e23 molecules/mol)  = 1 * 1 / 57.02 * 6.02e23  = 6.02e23 / 57.02 =  1.06e22

 

That means that a gram of glycine powder contains 10,600,000,000,000,000,000,000 molecules of glycine, more or less.

 

Glycine molecules are very small...

 

[gregcc]

That is amazing, just what i wanted.

Quick question though i have another document showing the mass as 75.07 for glycine
http://www.vanderbil...24/AAmasses.pdf

and one showing these results

http://education.exp...cs/aa-list.html

 

really confused as to which one i should be using in the calculation if just getting 99% l-glycine powder from an online vendor.

Appreciate the help