Cl2O7
Se calculeaza masa moleculara M
MCl2O7=2.35,5 +7.16=71+112=183
Daca in 183 g Cl2O7 SE AFLA 71 g Cl si 112 g O , atunci in 100 g Cl2O7 se
afla xg Cl si y g O
183gCl2O7----------71 gCl---------112 g O
100 g Cl2 o7----------xg-------------y g
x=100.71:183=38,79 la suta Cl
y=100.112:183=61,20 la suta O
