31. The cyclo oligomerization of thio ethanes illustrates the influence of steric effects on selectivity. 32. Scientists want to see whether Titan has oceans or seas of liquid methane and ethane . 33. Astrobiologist reducing ethane and acetylene to methane. 34. Some FCC gas recovery units may also separate out some of the ethane and ethylene. 35. Ethane , normal and iso butane, naphtha and stabilised condensate are held in tanks.36. For example, ethane ( C 2 H 6 ) has three equivalent staggered conformations. 37. The physical processes which give rise to ethane , butane, and more substituted molecules. 38. "' Hexafluoroethane "'is a fluorocarbon counterpart to the hydrocarbon ethane . 39. Ethylene and ethane that are proposed products have C-H bonds of similar strength. 40. Its molecular geometry is similar to ethane .