Generally speaking, any weapon intended to be wielded in one hand rarely weighs more than 2.5 lbs with many being less than 2 lbs. Doesn't matter whether it is a sword, mace or axe. There are exceptions but this is a good rule of thumb.
Here is a good example regarding maces. I started this when I discovered that Oakeshott was wrongly being used as a source for mace weights in Low-Tech.
http://www.myarmoury.com/talk/viewtopic.php?t=15182