Part B Compare bottles 1 and 2. How do the amounts of the reactants compare? How do the amounts of the
products compare? For these two bottles, does the amount of product appear to be proportional to the
amount of ammonia used?

They are all decomposition reactions.

The correct answer is b

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