C+02---> CO2 ori a moli
S+O2---> SO2 ori b moli
a/b=1/3--> b=3a
din bilantul de reactanti: ax12gC+bx32gS=540
ax12 + 3ax32= 540---> a= 5moli C; b=15moliS
a)in 540g amastec.....60g C.......480gS
100G................X................../Y .............................CALCULEA X,Y
b)n= (a+b) moliO2;---> 20moliO2................>40moliO
N=nxN,Avogadro
N= 40moli atx 6,023x10²³ atom/mol CALCULEAZA!