Răspunsuri

2014-08-20T13:40:55+03:00
Cp=md/ms *100

cp-concentratia procentuala
md-masa substantei dizolvate
ms-masa solutiei

15/100= md/2540 *100

3/20 = md/25,4

md= 3*25,4/20

md= 76,2/20

md=3,81 kg sare