Răspunsuri

2014-05-04T14:21:21+03:00
40% este concentratia initiala
2014-05-04T16:10:12+03:00
Ms1 = 400g
m apa = 200 g
c2=20%
c1=?
c2=md2/ms2*100=>md2=600*20/100=120 g
ms2=ms1+m apa = 400+200=600 g
md2 = md1
c1=md1/ms1*100=120/400*100=30%