CM v HCHO +H2 )CH3QH
47: Theobaira: n^ g 12,96/10 8= l,02(mol) 14
14.100 Ta c6: %m N/X 16 + R + 44 + R ' = > R + R' = 8 9 - 1 6 - 4 4 = 2 9 (C2H 0 Suy ra: R la - C H j - ; R ' la CH3 - = 15,73 X l a H 2 N - C H 2 - C O O C H 3 H 2 N - C H 2 - C O O C H 3 + NaOH -> H j N - C H 2 C O O N a + C H 3 O H x(mol) - > X C H 3 O H + CuO HCHO + Cu + H 2 O ' X > X HCHO + 2Ag20 ) 4 A g i + C 0 2 + H 2 0 X > 4x =>4x=0,12 o x = 0 , 0 3 ( m o l ) Vay m = 89.0,03 = 2,67 (g) D a p a n diing l a C .
'Au48: Trong qua gtfc chin rat giau ham lugng p-caroten (ti^n vitamin A)
D a p a n d u n g l a B .
Chu v: - Qua ga'c chiia p-caroten cao ga'p 68 \in ca chua (SGK hoa hoc 12 - Trang 190).
- Trong ru6t non va tuyg'n giap trang xay ra qua trinh chuyen hoa: enzimcarolenaza . .
Cdu 49: Gia sir nhifit phan 1 mol AgNO,:
A g N O j — ^ A g + N O j T + ^ O j t
Imol > Imol Imol 0,5mol ,HH, VfTSt*^^^^ => X: 1 mol Ag; Y: 1 mol NO, va 0,5 mol O, ' ' * ' '
2 N O 2 + - O 2 + H 2 O - > 2 H N O 3 l->0,25 ->l(mol) => Dung djch Z: chiia 1 mol HNO3
3Ag + 4 H N O 33 A g N 0 3 + NO + 2 H 2 O 0,75 <-Imol
1 , . «r 0,75.108.100% ^ . ,
Vay %mx(Ag) = " ^^^^ *^^P ^""8 l a Ạ CdM 5Q: Ta c6: mx = 2.(4,7.4) = 37,6(g)
Vi kh6'i lirong diroc bao toan, ndn: my = m^ = 37,6(g)
my 37,6 , / , x = > n Y = — = l(mol)
^ My 9,4.4 ^ '
Suy ra s6' mol khi giam 2 - 1 = 1 (mol).
"(andehit phdn Aig) — "(hidro phaiiumg) = ' (mol) => n(j„j.o| jg,, (.^i^ = 1 (moi)
RCHO + H2 ) R C H 2 0 H R C H 2 O H + Na R C H 2 0 N a + 0,5H2 t R C H 2 O H + Na R C H 2 0 N a + 0,5H2 t
Imol -> 0,5(mol)
vay V = 0,5.22,4 = 11,2 (lit) D a p a n d u n g l a B.
Chu v: S6' mol li6n hop khi giam = s6' mol H , phan ling = s 6 mol andehit doii chiic, no, phan ling = s6' mol ancol don chiic tao rạ
Cdu 51. * X + NaHCOj -> C O 2 +...
Vi Hx = a < nco2 - U^a < 2nx = 2a
=> Trong X g6m 1 axit no, ho, don chiic va 1 axit no, h6, da chiic.
Dat c6ng thiic chung cua hai axit la C„H2n+2-x (COOH)^ ((x = 1 va x = 2).
- '' C„H2„,2-x (COOH)^ ^ ( n + 1)H20
ămol) -> (n + l)a (mol) Theo bai ra: (n + l).a = a => n +1 = 1 => n = 0
vay axit Y la (n = 0, x = 1): HCOOH
Z la (n = 0, x = 2): HOOC-COOH ^ HCOOH + NaHCO,-> HCOONa + CO2 + H 2 O HCOOH + NaHCO,-> HCOONa + CO2 + H 2 O
y y HOOC - COOH + 2NaHC03 ^ N a O O C - COONa + 2CO2 + 2 H 2 O