n= V/Vm= 268/22,4->11,96molCH4
3mol<-,----- 3mol
R1:CH4+CL2---> CH3CL+HCL
2mol<--------------2mol
R2:CH4+2Cl2---> CH2CL2 + 2HCL
1mol<--------------1mol
CH4--------------> CH4
din 6molCH4...........3mol CH3Cl
11,96mol......................x........................calculeaza !!!!