= n/V=(m/)/V, = ×f, = (m/M)/(V×f) = /f, ..
=/f =×f.
4
0,2 r2(SO4)3?
= C×f, f = 1/6 Þ = 0,2×1/6 = 0,0333 M
w = m/m Þ m = w×m,
n = m/M Þ n = w×m/M (1)
,
= (m/M)/V = n/V Þ n= C×V=C×(m/r). (2)
(1) (2),
w = ×M/r C = w×r/M
: r /.
5
36 % 1, = 1,18 /
m = w×r/M=0,36×1180 //36,5 / = 11.6 /.
, w1 w2. w:
w2<w<w1.
m1/m2 = (w-w2)/(w1-w),
m1 m2 -
V1/V2 = (r2/r1) × ((w-w2)/(w1-w)),
V1 V2 - ; r2 r1 - . ,
m=m1+m2
m×w=m1×w1 +m2×w2.
: ,
1. ; w2 ;
2. (w1=1) (w2=0);
3. (w1= ) .
6.
15 % - H2SO4 100 50 % - H2SO4, 30% - ?
m1/m2 = (w-w2)/(w1-w) Þ m1 /100 = (30 - 15)/(50 - 30) = 15/20 Þ m1= 133 .
, :
w1 w - w2 = 50 A=15
w Þ 30
w2 w1 - w = 15 B=20
m1/m2 = 15/20 = 3/4
7
20 5 % - 1 r= =1,1 /, 2 % r= 1,02 /.
m1=V1×r1=20×1,1/=22 . :
5 2
2 Þ m1/m2=2/3 Þ m2= 22×3/2=33 .
0 3
m= m1+m2 =55, V=m/r= =55/1,02/=53.9 .
1. , 250 50 .
2. , ) 60 AgNO3 750 ; ) 15 NaCl 450 ; ) 75 K2CO3 300 .
3. ) 205 8 % - 23; ) 400 12 %- H2SO4; ) 750 15 % - 1.
|
|
4. 50 3 % -?
5. (III) 20 4 % -, 1,133 /?
6. , 500 20 % - , 1,133 /3?
7. 1 100 5 % - ?
8. Na2SO4 400 8 % - ?
9. 100 5 % - ?
10. 100 Na2CO3×102 , 4 % ?
11. 450 100 CuSO4×5H2O. .
12. 250 50 FeSO4×7H2O. FeSO4.
13. MnSO4×5H2O 100 , 20 % ?
14. 750 48 % - Na2SO4 300 2. Na2SO4 .
15. 400 20 % - 50 . ?