Question

which conformation of ethane is more prevalent at high temperature

Answer 1

The lowest energy conformation of ethane, is called the ‘staggered’
conformation, in which all of the C-H bonds on the front carbon are positioned
at dihedral angles of 60°relative to the C-H bonds on the back carbon. In this
conformation, the distance between the bonds (and the electrons in them) is
maximized,so it is the most stable and prevalent conformation