C = md/ms*100 => md = C*ms/100 = 20*200/100 = 40g NaOH
n NaOH = 40/40 = 1 mol
C6H5-CH3 + Cl2 => C6H5-CH2Cl + HCl
HCl + NaOH => NaCl + H2O
n NaOH = nHCl = 1 mol
n HCl = nC6H5-CH3 = 1 mol
mt = 1*92= 92g toluen
mp = 85*92/100 = 78,2g toluen
izomerii posibili: o-clorotoulen si p-clorotoluen