What is the mole fraction of NaCl in a mixture containing 7.21 moles
NaCl, 9.37 moles KCI, and 3.42
moles Lici?

The answer to the question is d

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