Răspuns:
Explicație:
1.
c=30%
mapa=5g
md
c=md.100 : ms
ms=md + mapa
30= md.100 : ( md + 5 )
30. ( md +5 )=100md
30md + 150=100md
100md- 30md=150
70md=150
md=150 : 70=2,14
md=2,14 g
2.
Vs=300ml=300cm³
ro=1,2g/cm³
c=10%
ms
md
ms=ro . Vs
ms=1,2g/cm³. 300cm³=360 g
md=c.ms : 100
md=10. 360 : 100=36 g