Răspuns:
c=mdx100/ms
ms=120g
c= 20%
md= cxms/100= 20x120/100g= 24g adevarat
m,apa= ms-md= 120-24=> 96g fals
md= 40gNaCl
c2= (md+40)x100/(ms+md)
= (24+40)x100/(120+40)
= 64x100/160%=40% adevarat
prin adaugare de apa= solutia se dilueaza adevarat
nu conduce curentul electric- fals
Explicație:
