5.0 g Ga 6.0 g As 8.1 g GaAs percent yield
Molten gallium reacts with arsenic
to from the semiconductor, gallium arsenide, GaAs.
Ga(l) + As(s) → GaAs(s)
If 5.0 g of gallium is reacted with 6.0 g of arsenic,
a) Which is limiting reactant?
(Ga = 70 amu, As = 75 amu)
b) If you obtained the 8.1 g of GaAs product,
what is the percent yield of the product?
---------------------------------------------------
5.0 g / (70 g/mol) = 0.07143 mol Ga
( 참고 https://ywpop.tistory.com/7738 )
6.0 / 75 = 0.08 mol As
Ga + As → GaAs
Ga : As = 1 : 1 계수비(= 몰수비) 이므로,
몰수가 작은 Ga이 limiting reactant.
( 참고: 한계 반응물 https://ywpop.tistory.com/3318 )
Ga : GaAs = 1 : 1 계수비(= 몰수비) 이므로,
생성되는 GaAs의 몰수 = 0.07143 mol
GaAs의 몰질량 = 70 + 75 = 145 g/mol
0.07143 mol × (145 g/mol) = 10.36 g
---> 이론적 수득량
percent yield = (8.1 g / 10.36 g) × 100 = 78%
( 참고: 수득률 https://ywpop.tistory.com/61 )
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