I am curious why there were changes in molar mass of lithium in the past.
The values were like 9 to 10 before 1830. But suddenly after 1830, the range of molar masses seems similar to the molar mass that is used now. I thought there might be some technical issues in the past. But, from 1830, the values were consistent and stable. So, I cannot assume there were lack of development in equipments and technics.
So, my questions are:
1. why the values were around 9-10 before 1830, not around 6.941?
2. why the values suddenly became similar to the molar mass which is used now?