The difference between strength training and mass training basically lies in the set/rep/poundage/rest interval protocol.If you are training for strength, you will want to use low reps(1-5)with atleast 80% of your 1rm or greater.The number of sets per exercise is a very individualistic variable.Some people can gain strength with just one or two sets per exercise.Others, like myself, require more sets to incur a neural adaption.When training for strength, I make the most progress with 5-6 sets(usually with the same weight)for each exercise.Rest intervals should be kept fairly high(3-5 minutes between sets) to allow your muscles to completely recover from the previous set.Mass a.k.a. hypertrophy training is usually 6+ reps with less than 80% 1rm.Only a few sets per exercise and short(1-2 min)rest intervals work for most people.These are just basic guidelines, and like most things dealing with training, some people will respond differently than others.I like to alternate 4-6 weeks of strength training with 4-6 weeks of hypertrophy training.I find this gives me the best progress without going stale.
------------------
"I'm just here to kick a$$, sleep till noon"