Răspuns:
ro=m/v---> m=roxv= 10x1g=10g=ms
md?
c= mdx100/ms===> md= cxms/100= 10x0,5/100g=0,05g sare
ms1= roxv=100g
c1=5%
md1= c1xms1/100= 5g
c2=2%
md2=md1=5g
ms2?
ms2= md2x100/c2= 5x100/2g= 250g
m,apa= ms2-ms1= 150g
c3= md3x100/ms3 unde md3= md1+md2
ms3= ms1+ms2=200+300=> 500g
md1= c1xms1/100= 2x200/100g= 4g
md2=c2xms2/100= 8x300/100g= 24g
c3=28x100/500=5,6%
Explicație:
