Calculate the empirical formula from the given percent compositions. 82% nitrogen (n), 18% hydrogen (h)

N41H9 The empirical formula is found basically by reducing a fraction. n/h=82/18=41/9

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