CnH2n-404 = 100 14n - 4 + 64 = 100 ^ n = 2,875 : loai 11.2. Dap an diing la C. 11.2. Dap an diing la C.
Chi s6' axit ciia chat beo la s6' rniligam KOH cSn thiet de trung hoa axit tu do CO trong 1 gam chat beọ axit tu do CO trong 1 gam chat beọ
S6' miligam KOH c^n dung la : 0,015.0,1.1000.56 = 84 (mg). 84 84
Chi s6' axit ciia chat beo la : — = 60. 14 14
11.3. Dap an diing la D.
S6' mol N2 = — = 0,025 mol Mv = = 74 dvC. 28 0,025 Cap chat este D c6 phan tu khd'i la 74 : PhiJ hgp. Cap chat este D c6 phan tu khd'i la 74 : PhiJ hgp.
11.4. Dap an diing la D.
Dat g6'c C^HjsCOO - la A - , gd'c C,5H3,COO - la B - . Cac trieste dugc tao thanh la : Cac trieste dugc tao thanh la :
CH2-A C H 2 - B CH2-A CHo-B CH2-A C H 2 - B
CH - A CH - B CH - A CH - B CH - B CH - A
CH2-A CH2-B CH2-B CH2-A CH2-A CH2-B
11.5. Dap an diing la C.
ME = 16 . 5,5 = 88 dvC ; n,,,, = ^ = 0,025 (mol).
88 Phuang trinh phan ling : Phuang trinh phan ling :
R-COO-R' +NaOH ^ R-COO-Na + R'OH 0,025 mol 0,025 mol 0,025 mol 0,025 mol
2,05 0,025 0,025
CH3-COO-R' =88 ^ R' = 29(-C2H5 ).
Cong thiic ca'u tao ciiạeste la : CH3 - COO - C2H5.
11.6. Dap an diing la D. Dat CTPT cua lipit la (C-H-COO)3C3Hg.
Phuang trinh phan iJng thuy phan lipit :
( C - H - C O O j C a H s + 3 H 2 O ^ 3 C - H - C O O H +X y y C3H5( O H)3
46
SÓ mol glixerol ~ ^ ~ ^'^ (mol) = s6' mol lipit. 4J.4
M„pu = =- 888 dvC.
3(12 X + y + 44) + 41 = 888 -> x = 17, y = 34. Dua vao 4 dap an cho ta tháy : Dua vao 4 dap an cho ta tháy :
X, = X2 = 17 la ph^- hgfp (vi khong c6 axit beo C,fi va C,n). y, = 33 , y^ = 35. y, = 33 , y^ = 35.
Vay CTPT ciia 2 axit h6o la : C 1 7 H 3 3 C O O H va CpHjgCOOH .
11.7. Dap an diing la B.
S6 mol cac chat: n^ = — = 0,1 (mol);88 nN.oH = 0-2.0,2 = 0,04 (mol). Phuong trinh phan ling xa phong hoa : Phuong trinh phan ling xa phong hoa :
C H 3 C O O C 2 H 5 + NaOH CHjCOONa + C 2 H 5 O H
Sau khi c6 can, chat ran con lai la CH3COONa .
Vi nN,oH < n6n tinh kh6'i lirgng CHjCOONa theo NaOH :
mcH.cooNa = 0,04.82 = 3,28 (gam) 11.8. Dap an diing la D. 11.8. Dap an diing la D.
Theo di bai, este X la metyl fomat (HCOOCH3), thuy phan trong m6i tru5ng axit: HCOOCH3 + HjO HCOOH + CH3OH tru5ng axit: HCOOCH3 + HjO HCOOH + CH3OH
(Y) (Z) - Axit HCOOH tan v6 han trong HjỌ - Axit HCOOH tan v6 han trong HjỌ