Răspuns :
H2O
se calculeaza masa moleculara M
MH2O=2+16=18
18 g H2O---------1mol H2O
X g H2O-----------0.5 moli H2O
X=18.0,5=9 g H2O
se calculeaza masa moleculara M
MH2O=2+16=18
18 g H2O---------1mol H2O
X g H2O-----------0.5 moli H2O
X=18.0,5=9 g H2O