- calculez moli, si masa de carbon
1mol 1mol 1mol
C + O2-----> CO2
x......................0,2mol
x= 0,2mol C
m= n(mol)xM(g/mo)
m,C= 0,2x12= 2,4g carbon
-calculez masa de carbune care contine masa obtinuta de carbon
100g carbune.........80gC
x..............................2,4g.....................calculeaza x !!!!