N/a has a greater average kinetic energy

N/a will transfer energy as heat to n/a

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

The total number of nucleons

Answer:   d.  carbon dioxide.

Ithink the answer is c