Question

what is the actual angle between electron groups for PCl3?

Answer 1

Similar to ammonia in the sense that electrons create a dipole. Also same point group. But it's angles are different since its phosphorus, I'm sure you can f find angle values online, search phosphorus trichloride on BING

Answer 2

It has a tetrahedral shape. with sp^3 orbitals. the angle should be 109.5.

Answer 3

but if you want the angle actually, it is 100 degrees.

source: http://en.wikipedia.org/wiki/Phosphorus_trichloride