Homework Help: Chemistry

Posted by Odesa on Friday, December 14, 2012 at 1:21am.

Chemical analysis of a silicon crystal reveals gallium at a level of 3.091X10^-2 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 - stranik, Friday, December 14, 2012 at 11:24am
1.598e14.
Chemistry - help, Friday, December 14, 2012 at 11:37am
an explanation please?
i need a formula!
Chemistry - babol, Friday, December 14, 2012 at 11:58am
The answer is not right, at least for me. anyone who knows how to do it and could write how ?
Chemistry - qwerty, Friday, December 14, 2012 at 7:44pm
Please, I need the formula!
Chemistry - Odesa, Friday, December 14, 2012 at 9:04pm
The answer 1.598e14 was not right for me too. Any ideas what happen and how to write it out?
Chemistry - chelo, Friday, December 14, 2012 at 9:56pm
What is the formula to use
Chemistry - chelo, Friday, December 14, 2012 at 10:00pm
Please, I need the formula!
Chemistry - Anon, Friday, December 14, 2012 at 11:06pm
The data for everyone of us is different as you noticed formula is required
Chemistry - Anon, Friday, December 14, 2012 at 11:08pm
Go to back to H4P2
Chemistry - Odesa, Friday, December 14, 2012 at 11:46pm
As its Si: 5.00*10^22 / (gallium level*10^-2) by someguy
Chemistry - Odesa, Friday, December 14, 2012 at 11:56pm
1.5455*10^19
Chemistry - aaa, Saturday, December 15, 2012 at 12:25am
gallium level*10^-2) what is this?
Chemistry - qwerty, Saturday, December 15, 2012 at 2:39am
What is the formula, please?
Chemistry - School girl, Saturday, December 15, 2012 at 3:25am
What about 3.091*10^-7? please
Chemistry - anon2, Saturday, December 15, 2012 at 9:36am
H4P2
Chemistry - Anonymous, Saturday, December 15, 2012 at 10:26pm
1.6265*10^14 i have the answer for 3.091*10^-7
here the caculation
atomic percent*NA(avogadro number)

the solution/atomic volume of gallium
Chemistry - Anonymous, Sunday, December 16, 2012 at 12:13am
1.5442*10^14
this is the corect ones
Chemistry - qwerty, Sunday, December 16, 2012 at 10:44am
step1
(6.023*10^23)/(12.05)=m

step 2
m*(level of atomic percent)*(10^-2)

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