Homework Help: CHEMISTRY

Posted by dato on Friday, December 14, 2012 at 12:11pm.

Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−8 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?

CHEMISTRY - someguy, Friday, December 14, 2012 at 11:03pm
As its Si: 5.00*10^22 / (gallium level*10^-2)
CHEMISTRY - anonymous, Friday, December 14, 2012 at 11:50pm
this one is wrong
CHEMISTRY - Yamy, Saturday, December 15, 2012 at 12:52am
5.00*10^22 / (gallium level*10^-8)
CHEMISTRY - student, Saturday, December 15, 2012 at 4:27am
i cant get right answer pls help
CHEMISTRY - baba, Saturday, December 15, 2012 at 5:06am
1.54e13
CHEMISTRY - MIT2, Saturday, December 15, 2012 at 5:31am
CHEAT!

Do NOT help this person. They are trying to cheat in a midterm exam.
CHEMISTRY - Odesa, Saturday, December 15, 2012 at 5:52am
(6.023*10^23)/(12.05)=m
m*(3.091*10^-8)*(10^-2)=
CHEMISTRY - Anonymous, Sunday, December 16, 2012 at 4:58am
funny enough all those who say cheat only post afterthe answer are revealed. thank to MIT2
CHEMISTRY - XXX, Sunday, December 16, 2012 at 11:59am
Funny enough to be bere and say f.u.ck off b1tches and as.s.holes!!!

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