== Ethylene oxide == 

 Change ...and the maximum 'degree of conversion' of ethylene to ethylene oxide is 6/7 or 85.7%... 
 to 'selectivity' 
 Refer: Page 11, Kilty P. A.; Sachtler W. M. H. (1974). "The mechanism of the selective oxidation of ethylene to ethylene oxide". Catalysis Reviews: Science and Engineering 
 http://www.tandfonline.com/doi/pdf/10.1080/01614947408079624