Question

calculati masa moleculara a următorilor cristalohidrati: CuSo4*5H2O, Na2O*10H2O, FeSo4*7H2O, CaSo4*2H2O

Answer 1

$M_{CuSO_4{\cdot}5H_2O}=A_{Cu}+A_S+4A_O+5\cdot(2A_H+A_O)=64+32+4{\cdot}16+5{\cdot}18=250\ g/mol\\\\M_{Na_2O{\cdot}10H_2O}=2A_{Na}+A_O+10\cdot(2A_H+A_O)=2{\cdot}23+16+10{\cdot}18=242\ g/mol\\\\M_{FeSO_4{\cdot}7H_2O}=A_{Fe}+A_S+4A_O+7\cdot(2A_H+A_O)=56+32+4{\cdot}16+7{\cdot}18=278\ g/mol\\\\M_{CaSO_4{\cdot}2H_2O}=A_{Ca}+A_S+4A_O+2(2A_H+A_O)=40+32+4{\cdot}16+2{\cdot}18=172\ g/mol$