please help fast!! Sodium sulfide reacts with lead (II) phosphate to produce sodium phosphate and lead (II) sulfide. If you start with 1.45 grams of sodium sulfide how many grams of lead (II) phosphate must react with it?

The answer is d.potassium

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