mC: mH= 75:25
nC:nH= 75/12 : 25/1
= 6,25 : 25
= 1 :4-------------------> CH4-metan
CH4 +Cl2---> CH3CL +HCL
CH4 + 2O2---> CO2 + 2H2O +Q
CH4 +
CH4 + 3/2O2 +NH3--> HCN+ 3H2O
Q=2670kj
q=890kj/mol---> n= Q/q= 2670kj/890kj/mol=3mol CH4
V=nxVm= 3molx22,4l/mol-=.............................calculeaza !!!!