No, there's no way to get an exact number of experience points you need for a level or the exact number of experience points you'll get for killing a particular mob. The info simply isn't available.
However, as someone said recently in response to a similar question, if you know, for example, that you get 1% experience per kill, you can just tell yourself you need 100 experience points to level, and that you get 1 experience point for each mob.
-- Darryl