Polyethylene can be produced from calcium carbide according to the following sequence of reactionsThe mass of polyethylene which can be produced from 40.0 kg of CaC2 is

64 grams CaC2 gives 26 grams HC≡CHSo 64 kg CaC2 gives 26 kg HC = CHSo 40 kg CaC2 gives 26 x 40/64 kg HC≡CH                                       = 16.25 kg HC≡CHNow 26 kg HC≡CH gives 28 kg polytheneSo 16.25 kg HC≡CH gives 28 x 16.25/26 kg polythene                                = 17.5 kg