Homework Help: Chemistry

Posted by selly on Monday, November 19, 2012 at 6:35am.

Determine the amount (in grams) of boron that when substitutionally incorporated into 1 kg of silicon will establish a charge carrier density of 3.091×1017 carriers/cm3.

Chemistry - ssb (India), Tuesday, November 20, 2012 at 2:22am
Answer : 2.4227*10^-3
i.e. 0.002423
Chemistry - c, Wednesday, November 21, 2012 at 5:53pm
thanks
Chemistry - Jose Violero, Thursday, November 22, 2012 at 6:24am
Information
density Si=2.33 g/cc
Mw(P)=10.81 g/mole
NA=6.022*10^23 at/mole

V (Si)=1 Kg *1000 g/Kg /(2.33 g/cc = 4.29*10^2 cc

moles B/cc = 3.091*10^17 carriers/cc /6.022*10^23 =5.133*10^-7 moles B/cc

moles B= 5.133*10^-7 moles/cc *4.29*10^2 cc= 2.203*10^-4 moles B

g B= 2.203*10^-4 moles * 10.81 g/mole = 2.4227*10^-3 g

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