Ольга Коптелова 4)CnH2n+1COOH+KOH=H2O+CnH2n+1COOK n KOH=5*1,4*0,4:56=0,05=n CnH2n+1COOH M CnH2n+1COOH=3,7:0,05=74 14n+45=74 n=2 C2H5COOH пропановая