The process of preparing ethylene

During the process of preparing ethylene from the cracking of pure
ethane, the conversion per pass of ethane is 60%. If 46.4kg of
ethylene can be obtained from 100kg of ethane which was input
into the cracker. After the separation of pyrolysis gas, most of the
unreacted ethane is recycled back to the cracker (suppose the
circulating gas is only ethane). It is also known that the products
still contain 4kg of ethane except ethylene and other gases.
Question: Please figure out the selectivity, the yield per pass,
the total yield and the total mass yield of ethylene, as well
as the total conversion of ethane

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