Răspuns:
c,m= niu/V
c%=mdx100/ms
solutia 1
V1= 0,3 L
niu1= 1,8mol/lx0,3 l= 0,54 mol
ms1= VS1Xro= 300mlx1,12g/mo= 336g
solutia2
niu2=niu1=0,54mol
Vs2= Vs1+ V apa= 0,6 l
cm2= 0,54/0,6 mol/l= 0,94mol/l
c%=\
md= niu2xM= -0,54x98g= 52,92g
ms2=ms1+m,apa= 336g+ 300mlx1g/ml= 636g
c= 52,92x100/636= 8,32%
Explicație: