A chlorine concentration of 0.500 ppm is desired for water purification. What mass of chlorine must be added to 2500 L of water to achieve this level?

The correct answer is c

Idon't know hope someone you

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