Why is the dissolving process important?

The solvent particles must move apart to make room for solute particles. This process requires energy to overcome forces of attraction between solvent particles. The first step in the dissolving process is endothermic.

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