Assume that 3 g of compound A reacts with 6 g of compound B. A solid is produced in the reaction, and some gas is also released. The solid has a mass of 2 g. What is the mass of the gas that was released in the reaction? How do you know?

The correct answer is "atomic weight".

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 answer is neonhope it