Copper used in electric wires comes in two isotopes: 63Cu and 65Cu. Cu63 has an atomic mass of 62.93 amu makes up 69.15% and Cu65 with an
atomic mass 64.928 amu makes up 30.85%. Find the relative mass of
copper.

The correct answer is 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 correct answer is "false"