n1 moli C6H5-CH3 + Cl2 = Cl-C6H4-CH3 + HCl
n2moli C6H5-CH3 + 2Cl2 = Cl2C6H4-CH3 + 2HCl
n3 moli C6H5-CH3 nereactionat
n1/3 = n2/2 = n3/1 = n/6 n1 = n/2 n2 = n/3 n3 = n/6
nHCl = n1 + 2n2 = n/2 + 2n/3 = 7n/6
solutia HCl : nd = 7n/6 Vs = 7 l cM = 2moli/l
7n/6 = 14 n = 12moli
m toluen = 92(6+4+2) = 1104g