Calculate the number of moles equal to 4.3 x 10^25 molecules of C2H6

What are the choices?

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   

08.01 hope this and can i get brainlist? ?