Question

calculati ce masa de acid sulfuric este continuta in 250g de solutie cu partea de masa a substantei dizolvate de 4,9%

Answer 1

Cp=md/ms*100==>md=Cp*ms/100=4.9*250/100=12.25g H2SO4

Answer 2

c = md/ms * 100
ms = 250
c = 4.9%
md = ms*c/100 = 250*4.9/100 = 12.25 g 
masa acid = 12.25 g