Răspuns:
c=mdx100/ms---> unde ms=md+m,apa
ms= 200g
c= 10%
md= 10x200/100g= 20g -masa substantei
-m,apa= ms-md= 200g-20g=180g-masa apei
-ro,apa= 1g/ml---> V,apa= roxm= 180ml-vol.apei
-ro,sol=1,1g/ml---> Vs= roxms= 1,1x200ml=220ml-vol. solutiei
Explicație: