Răspuns:
1. v,apa= 120ml
ro,apa= 1g/ml
m,apa= 120x1 g= 120g
md=80g
ms= md+m,apa= 80+120=> 200g
c=mdx100/ms=80x100/200%=........calculeaza!!
2.M,NaOH= 40g/mol
niu=md/M= 80g/40g/mol= 2mol
ms=200g
vs= m,s/ro=200/1,4726 ml=135,8 ml=0,1358 l
c,m= niu/v,s= 2mol/0.1358 l=.......calculeaza !!
Explicație: