Ответ: CnH2n-2+2HBr->CnH2nBr2CnH2n-2+2HCl->CnH2nCl2n(CnH2nBr2)=n(CnH2nCl2)18,8\(14*n+160)=9,9\(14*n+71)18,8*(14*n+71)=9,9*(14*n+160)263,2*n+1334,8=138,6*n+1584124,6*n=249,2n=2C2H2 -ацетилен