Polyethylene can be produced from calcium carbide according to the following sequence of reactions
`CaC_(2)+H_(2)orarr CaO+HC-=CH`
`nHC-=CH+nH_(2) rarr(-CH_(2)-CH_(2)-)_(n)`
The mass of polyethylene which can be produced from `40.0 kg ` of `CaC_(2)` is