MMgSO4*7H2O = 120+126 = 246g/mol
246g cristalohidrat.....120g MgSO4.....126g H2O
307,5g .....X = 150g MgSO4 ...Y = 157,5g
md = 150g
ms = 307,5+1000 = 1307,5g
C = md/ms*100 = 150/1307,5*100 = 11,47%
5. MCuSO4*5H2O = 160+90 = 250g/mol
250g cristalohidrat...160g CuSO4...90g H2O
500g......X = 320g....Y = 180g H2O
C = md/ms*100 = 320/500*100 = 64%
25 = 320/320+mH2O*100 => 25mH2O+8000 = 32000 => 25mH2O = 24000 => mH2O = 960g
mH2O adăugat = 960-180 = 780g
V H2O = 780mL sau cm3
