avem doar mono si diclorurare
raport de 3:3:2 => 3x moli:3x moli:2x moli
n=V/Vm=179,2/22,4=8moli metan
1mol..1mol...1mol
CH4 + Cl2 -> CH3-Cl + HCl
3x.....3x.......3x
1mol...2moli.....1mol
CH4 + 2Cl2 -> CH2Cl2 + 2HCl
3x......6x.........3x
1mol....1mol
CH4 -> CH4
2x........2x
obtinem ca 8x=8 => x=1mol
nCl2=9moli => VCl2=9*22,4=201,6l Cl2 (c.n)