A 0.200 L sample of neon gas at 270 K is cooled until the volume is 0.180 L. What is the new temperature?

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 disturbance is only parallel to the motion of the wave.

The answer is ax3. hope this