The molecular weight of h2 and the mass of 1 mole of h2 are a. quantities b. different quantities c. inversely related d. not the same

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 phase where ice changes directly to gas is called sublimation