1. 250 50 FeSO4 × 72. () .
. 250 + 50 = 300 .
50 . FeSO4 ×72O 278 /, FeSO4 152 /. FeSO4 50 FeSO4 × 72
278 FeSO4 × 72 152 FeSO4;
50 FeSO4 × 72 FeSO4;
= (50 × 152): 278 = 27,34 .
300 :
2. 200 50% 20 . , .
.
.
200 20 = 180 , : 100 20 = 80 . , , : w = (80 × 100): 180 = 44,44%.
3. l2, 40 1,04 . ?
. l2 208 /, (l2) = (l2): 2 = 104 /. ᒺ 0,04 . l2
/.
ϳ (l2) (l2), eq (l2) = 0,25 /.
4. l 36,5%, r = 1,18 /3.
. 1 (1000 3)
m- = r × V = 1,18 × 1000 = 1180 .
1180
; .
(l) , , (l) = 36,5 /
/.
5. ᒺ NO3 w = 20% (r = 1,115 /3) ᒺ NO3 w = 4% (r = 1,025 /3)?
. (m2): m2 = r2 × V2 = 1,025 × × 2500 = 2562,5 . NO3
; .
NO3 (m1)
; .
ᒺ
V1 = m1 : r1 = 512,5: 1,115 = 459,6 3.
: m (2) = m2 m1 = 2562,5 512,5 = 2050 .
6. ᒺ NaOH 36% (r2 = 1,39 /3) 200 NaOH 11% (r1 = 1,12 /3), 20%.
. : 36 9
20
11 16
NaOH 36% 9 , 11% 16 .
NaOH 11%:
|
|
m1 = r1 × V1 = 1,12 × 200 = 224 .
NaOH 36%:
16:9 = 224: m2; m2 = (224 × 9): 16 = 126 .
ᒺ NaOH 36%:
V2 = m2 : r2 = 126: 1,39 = 90,65 3.
7. (r1 = 1,32 /3) ᒺ 50 ᒺ 150 . 10%. (%) .
. (m1)
m1 = r1 × V1 = 1,32 × 50 = 66 .
(m2)
m2 = m1 + m (2) = 66 + 150 = 216 .
O
.
O :
.
1.
1. ᒺ 13,3 , 0,2 /?
2. CuCl2 26% 800 CuCl2 22. .
2.
1. ᒺ 5 HNO3 50% (ρ = 1,31 /3) ᒺ 50 HNO3 10% (ρ = 1,055 /3), 100 . HNO3 ?
2. ᒺ 2 /, 28,6 Na2CO3 102.
3
1. , 500 100 KNO3 (ρ = 1,118 /3).
2. ᒺ 23 16% (ρ = 1,14 /3), 23 ᒺ 3 Ceq (23) = 0,5 /.
4.
1. 100 Cl2 30% (ρ = 1,282 /3)?
2. 100 H2SO4 62% (ρ = 1,52 /3) 760 . 1,52 /3. H2SO4 Ceq .
5.
1. CuSO4 4% 2 12%, 10%?
2. ᒺ Na2SO4 0,2 / 3 Ceq = 0,16 /?
6.
1. FeSO4 5 0,4 /?
2. ᒺ 7 HNO3 ω = 48% (ρ = 1,3 /3), 2 /?
7.
1. AgNO3 20 1 /. ?
2. ᒺ NaOH 50% (ρ = 1,53 /3), NaOH ᒺ 2,5 0,2 /.
8.
1. 500 HCl 40% (ρ = 1,198 /3) 2,5 . HCl .
2. MgCl2 62 40 0,3 /?
9.
1. H3O4 10 90% (ρ = 1,74 /3)?
|
|
2. 20 N2O3 17% (ρ = 1,18 /3) 80 N2O3 15% (ρ = 1,16 /3) 1 . .
10.
1. 2 28,75 ZnSO4 7H2O. () .
2. 3 0,12 / 85 0,5 /. ᒺ, .
11.
1. 2 28,75 ZnSO4 7H2O. () .
2. ω = 48% (ρ = 1,49 /3) 100 ω = 49% (ρ = 1,5 /3), 7 1,2 /?
12.
1. Pb(NO3)2 1 , 38%?
2. ᒺ HCl 4% (ρ = 1,02 /3), HCl 2% (ρ = 1,01 /3).
13.
1. Na2CO3 102 , 5 Na2CO3 15% (ρ = 1,16 /3)?
2. , 250 (N4)2S 0,4 /? ?
14.
1. 24 60% 140 90%.
2. ' ρ = 1,840 /3 96 %, 2 1,92 /.
15.
1. 1 90%, 70%?
2. ᒺ , - 300 5 % ( ρ = 1,001 /3).
16.
1. 100 (1) = 1,5 /, (1) = 0,4 /.
2. , 50 FeSO4. 7H2O 450 .
17.
1. CuSO4 6% 1 15%, 10%?
2. י 36,6 % ρ = 1,300 /3 1,5 0,1 /?