Question

Determinati masa de zahar care trebuie adaugata la 80 g apa pentru a obtine o solutie de concentratie 15%.

Answer 1

$c = \frac{md}{ms} \times 100$

ms=md+mapa

ms=md+80

$15 = \frac{md}{md + 80} \times 100$

15md+1200=100md

1200=85md

md=1200:85

md=14,11 g