# Chemistry problem

• Oct 3rd 2008, 04:14 PM
phthiriasis
Chemistry problem
Determine the mass, in grams, of a quantity of the amino acid lysine, http://img81.imageshack.us/img81/7466/renderkp1.gif containing 3.13 mol N atoms.

i tried a few different things but none of them seem to give me the right answer.
• Oct 3rd 2008, 04:26 PM
o_O
Since you have 3.13 moles of nitrogen atoms and there are 2 nitrogen atoms per molecule, there must be $\frac{3.13}{2} = 1.565$ moles of lysine.

The molar mass of lysine is 146.188 g/mol (from wikipedia, use your own period table for this value).

Simply multiply them together and you should get the amount of lysine in grams.