Nitric acid is a chemical used in fertilizers and explosives. It is created by a mixture of ammonia and oxygen. NH32O2 HNO3H2O How many grams of O2 are needed to react with 80.0 g of NH3

The answer is c) pyrite

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