CH4 + Cl2 => CH3Cl + HCl / 1
CH4 + 2Cl2 => CH2Cl2 + 2HCl / 2
CH4 + 3Cl2 => CHCl3 + 3HCl / 2
CH4 + 4Cl2 => CCl4 + 4HCl / 1
nCH4 ( numar de moli CH4) = 1+2+2+1 = 6 moli CH4
nHCl = 1+4+6+4 = 15 moli HCl
6moli CH4 ....... 15 moli HCl
x .............. 30 : 1000 moli HCl
x = (30 : 1000) * 6 = 0,012 moli CH4 = 0,012 * 22,4 = 0,2688 L CH4