Homework Help: chemistry

Posted by lisa on Friday, December 14, 2012 at 9:07am.

Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−6 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Si crystal?
unanswered

chemistry - Anonima, Friday, December 14, 2012 at 9:36am
wrong answer...
chemistry - School girl, Friday, December 14, 2012 at 1:28pm
Any hint how to do it?
chemistry - MIT2, Saturday, December 15, 2012 at 5:35am
CHEAT!

Do NOT help this person. They are trying to cheat in a midterm exam.
chemistry - Odesa, Saturday, December 15, 2012 at 5:02pm
As its Si: 5.00*10^22 / (gallium level*10^-2) by someguy

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