Question

Salut dau 54+coroana si inima puncte ajutatima la cele 7 probleme.Va rog repedee.

Answer 1

1)ms=400g. ,md=80g C?
C=80•100\400=20%
2)ms=500kg,md=85kgc?
C=75*100\500=15%
ms=? c=15%md=60kgms=38,4*100\15=256kg sol
4)ms=?C=4%,md=50kg(48kg apa si ,2kg sare)
md=? ms 50g c=8%
md=4gNaOH
6)mdcristalohidrat{?
Ms=20kg,c=1,5% 184,615 anhidru
CuSO4
7). C=?,md=25, mH2O=475g C=25*100/500=5%