Question

Care este concentratia procentuala de masa a unei solutii care se obtine prin dizolvarea a 30 g de zahar in 120 g apa ?

Answer 1

[tex]md=30g \\ \\ m H_{2} O=120g\\\\------\\\\ \frac{c}{100} = \frac{md}{ms} \\\\ms=md+m H_{2} O\\\\ms=30+120=150g\\\\c= \frac{100*30}{150} \\\\c=20(la-suta) [/tex]

Answer 2

c = md/ms * 100
md = 30 g zahăr
ms = md + m apă = 30+120 = 150 g
c = 30/150*100 = 20%