1. The problem statement, all variables and given/known data Prior to 1961, the physical standard for atomic masses was 1/16 the mass of the oxygen atom. The new standard is 1/12 the mass of the carbon atom. Determine the conversion factor needed to convert from old to new atomic mass units. How did this change affect the value of the avagadro constant? 2. Relevant equations 3. The attempt at a solution I must really be derping here. 1/16th the mass of an oxygen atom is the same as 1/12 the mass of the carbon atom. I haven't taken chemistry in awhile so maybe I am missing something really basic here.