1. The problem statement, all variables and given/known data What is the difference between amu and u? In my book they seem to use u but on my online homework it uses u and it seems to be the same thing. 2. Relevant equations chemistry has too many special units 3. The attempt at a solution atomic mass unit 1/12 mass of an atom of carbon 12 u unified atomic mass unit 1 g/mol I still don't understand whats the importance of the two like what equations do you use over the other.