CaC2+2H2OightarrowCa(OH)2+C2H2 64 kg Ethyne,26kg
(ii) C2H2+H2ightarrowC2H4 Ethylena,28 kg(iii) nC2H2ightarrow[−CH2−CH2−]n n×28 kg n×28kg polythene or 28 kg or 28 kg Thus 64 kg of CaC2 gives 26 kg of acetylene which in turn gives 28 kg of ethylene whose 28 kg gives 28 kg of the polymer, polythene.