Yes, mols is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
mols
Noun
1. The molecular weight of a substance expressed in grams; the basic unit of amount of substance adopted under the Systeme International d'Unites
What Scrabble words can I make with the letters in mols?
3 Letter Words
2 Letter Words