- Zn la nguyen t6'd c 62 electron hoa tri nhom IIB.
f7.55 Daps6 diinglaB.
C^c phuomg trinh phan umg khir h6n hop cho bifét: 4,48
J^H, = "CO = "CO, = ' 2 22,4 = 0,2 mol.
Că0H)2(du)+CO2 ^ C a C 0 3 i + H 2 0
nCaC03=nC02 =0,2 mol ^ mcaCO, = 0,2 .100 = 20 gam.
' 7.56. Dap s6' dung la C.
Cdc phuong trinh phan ling :
3CU + 8HNO3 - > 3Cu(N03)2 + 2 N O + 4H2O (1)
2NO + O2 ^ 2NO2 (2)
4NO2 + 2 H 2 O + O 2 -> 4HNO3 (3)
Theo (1,2): HNÔ = " N O = f "CU = | • ^ = 0,2 mol. Theo (2): HQ^ (2) = ^ nNô = 0,1 mol.
-> = 0,1 + 0,05 = 0,15 mol VQ^ =0,15 .22,4 = 3,36 lit. 7.57. Dip s6 diing 1^ D.
Cic phuong trinh phan ling :
(1) Fe + 2Ha -> FeCl2 + H2
224
-> npe = —— = 0,1 mol mpg = 0,1.56 = 5,6 gam. 22,4
(2) Fe203 +6HC1 -> 2FeCl3 +3H2O
(3) FeCl2 + 2NaOH ^ Fe(OH)2 i + 2NaCl
(4) FeCl3 + 3NaOH ^ Fe(OH)3 i + 3NaCl
(5) 4 Fe(OH)2 + 0 2 ^ 2 FcsOj + 4 H2O T (6) 2Fe(OH)3 "> Fe203 + 3 H 2 0 t
24
S6 mol Fe203 sau khi nung = =0,15 mol. ^ ^ 1 6 0
Theo(l,2.3.4,5,6):
S6' mol Fe203 do Fe tao ra la : = 0,05 mol.
S6 mol Fe203 trong h6n hop la : 0,15 - 0,05 = 0,1 mol.
a = mFe + mFe2O3 = 5,6 + 0,1.160 = 21,6gam.
7.58. DdpdndungmẠ
CAc phuong trinh phan dug :
2A1+Fe203 Al203 +2Fe (1)
2A1 + 3CuO AI2O3 + 3Cu (2)
Fe + 6HN03 ^ Fe(N03)3 + 3NO2T + 3H2O (3)
C U + 4HNO3 -> Cu(N03)2 +2N02t + 2H20 (4) (adsbygoogle = window.adsbygoogle || []).push({});
Goi X va y la s6' mol Al tham gia phan ung (1) vk (2). 232
n S4
+ y = — = 0,0227 mol.
npe = X mol -> iiNOzO) = 3x.
ncu = -.y mol 0 ^ 0 2 ( 4 ) = 2. - y = 3ỵ *
"NOz = 3x + 3y = 3(x + y) = 3.0,02 = 0,06 mol.
^ =0,06.22,4 = 1,344 lit. , ^, ^
,59. Dip in dung la B.
Cac phuong trinh phan ling :
Phan I: 2Cu + O2 ^ 2CuO (1)
4AI + 3O2 2AI2O3 (2)
Goi X y Ik s6' mol Cu va Al c6 trong m6i phfin. Ta c<5 :
80x + 51y=18,2 (I)
Phan 2: Cu + 2 H 2 S O 4 d.n C U S O 4 + S02t + 2 H2O (3)