2.
2:1:1:1 => 2x moli cloro, x moli dicloro, x moli tricloro si x moli metan
n=V/Vm=15,68/22,4=0,7moli
1mol..............1mol......1mol
CH4 + Cl2 -> CH3-Cl + HCl
2x moli.........2x moli...2x moli
1mol................1mol........2moli
CH4 + 2Cl2 -> CH2Cl2 + 2HCl
x moli..............x moli......2x moli
1mol................1mol.....3moli
CH4 + 3Cl2 -> CHCl3 + 3HCl
x moli..............x moli...3x moli
1mol...1mol
CH4 -> CH4
x moli..x moli
obtinem 7x moli HCl
7x=0,7 => x=0,1moli
nCH4introdus=5x=0,5moli
V=n*Vm=0,5*22,4=11,2l CH4 pur
80/100=11,2/Vimpur => Vimpur=11,2*100/80=14l CH4
3.
clorometan - agent frigorific