Question

ajutatima repede va rog frumos dau coronita ​

Answer 1

Răspuns:

1)c = md*100/ms

md = 40 g

ms = md + m apă = 40+360 = 400 g soluție

c = 40*100/400 = 10%

2)360-40=320g apa

320 g apa +40g zahar = 360 g solutie

40g zahar / 360g solutie *100=11,11% concentratie zahar in solutie

R : A) 11,11%

3)350g * 12% = 42 g zahar (in prima solutie)

350 -42 = 308 g apa (in prima solutie)

42 g +10 g = 52 g zahar (in a doua solutie)

308g +120g= 428 g apa (in a doua solutie)

52g zahar +428 g apa = 480g solutie

Concentratia solutiei obtinute :

52g / 480g *100= 10,83%

Succes!