Question

4 exercitii care vreti din cele 8 va rog

Answer 1

1. C=?
md=10g
ms=200g
C=md/ms *100=10*100/200=1000/200=5%
C=5%
masa de apa=200g-10g=190g

2. C=5%
ms=120g
md=?
C=md/ms*100
md=C*ms/100=5*120/100=600/100=6g

3. C=15%
md=200 g
ms=?
C=md/ms *100
ms=md*100/c
ms=200*100/15=20000/5=4000 g

4. C=9%
ms=500g
md=?
C=md/ms *100
md=c*ms/100
md=9*500/100=45 g