Răspunsuri

2014-03-31T14:27:13+03:00
C%=md/ms * 100=>ms = md/c * 100=15/30 * 100=50 g solutie
ms = md + m apa => m apa = ms - md = 50 - 15 = 35 g apa
2014-03-31T17:17:07+03:00
100g sol............30g sare x g sol................15g sare x= (15*100)/30 x=50