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MINHNHATHUYNHNGUYEN
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 Posted - 04/16/2003 : 00:13:16  
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Minh dang bi 2 bai tap hoa:
1/Co 2 hydrocacbon A va B .Dot chay hoan toan m(g) moi chat deu thu duoc 0.792g CO2 va 0.162g H2O.
a/Tim cong thuc don gian cua A,B
b/Xac dinh cong thuc phan tu cua A,suy ra cong thuc cau tao bieta la ankin.
c/Tron 0.6 mol A voi 0.4 mol B de duoc hon hop X.Cho hon hop X qua dung dich AgNO3 trong NH3 co thua thu duoc 207.6g ket tua.Xac dinh cong thuc phan tu, cong thuc cau tao cua B.
2/Dot chay hoan toan 11g hon hop X gom metan,propilen,axetylen can vua dung 128.8 lit khong khi.11.2 dm3 X phan ung vua du voi 1 dung dich chua 100g brom, cac the tich khi do o dkc.The tich oxy chiem 1/5 the tich khong khi.Xac dinh thanh phan % ve the tich X.
BAN NAO GIAI DUOC MINH XIN CAM ON NHIEU
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salem85
27 Posts
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Posted - 04/16/2003 : 14:24:25
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1/ tu luong CO2 va H2O => ctdg A,B la (CH)n
A la ankin => A la C2H2
C2H2 + Ag2O/NH3 => C2Ag2 + H2O
CnHn + a/2 Ag2O/NH3 => Cn H(n-a)Aga + a/2H2O (*)
m ket tua o (*) = 207,6 � 240.0,6 = 63,6 g
=>M = 13n +107a = 159 => n = 4, a = 1
=> ctpt B : C4H4 ( vinyl axetilen )
2/ Dat so mol CH4, C3H6, C2H2 trong 11 g hh la x,y,z
11,2 l hh la kx,ky,kz
theo de bai ta duoc he: 16x + 42y + 26z = 11
2x + 4,5y + 2,5z = 1,15
k(x + y +z) = 0,5
k(y + 2z) = 0,625
giai he => x = y = 0,1 ; z = 0,2
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BAI TAP HOA 11