3. Fertilisers supply the essential elements, nitrogen, phosphorus and potassium for plant growth. A bag of fertiliser contains 500 g of ammonium sulfate, (NH4)2SO4, and 500 g of potassium nitrate, KNO3.
Calculate the percentage by mass of nitrogen in the bag of fertiliser.

Hi; /c

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