Question

Calculeaza concentratia procentuala a unei solutii obtinuta prin dizolvarea a 50g cuso4, 5h2o in 250g apa. Urgent! Dau 25 pct.

Answer 1

MCuSO4*5H2O = 160+90 = 250g/mol
Manhidru = 160g/mol

250g CuSO4*5H2O.....160g CuSO4.......90g H2O
50g CuSO4*5H2O.....xg CuSO4......yg H2O

x = 160*50/250 = 32g CuSO4
y = 90*50/250 = 18g H2O

md = 32g

ms = 250+50 = 300g

C = md/ms*100 = 32/300*100 = 10,66%