Răspuns:
se aplica relatia c=mdx100/ms, unde ms=md+m,apa
c3= md3x100/ms3 unde md3=md1+md2
ms3=ms1+ms2
ms se calculeaza din densitate, ro=m/v
solutia 1
ms1= 400x1,437g= 574,8g
md1= c1xms1/100= 40x574,8/100g= 230g
solutia2
ms2= 800x1,225g=980g
md2= 20x980/100g= 196g
solutia 3
md3= 426g
ms3=1554,8g
c3=27,39%
Explicație:
