Question

determina masa de acetona necesara obtinerii de 500g solutie de concentratie 9%

Answer 1

ms=500g
C=9%
$c = \frac{md}{ms} \times 100$
de aici =>
$md = \frac{c \times ms}{100}$
md=(9•500):100=9•5=45g
Sper ca te-am ajutat

Answer 2

c = md*100/ms
md = 500*9/100 = 45 g acetonă