Which is a better unit for expressing molar mass, amu or grams/mole?
While the numeric values are the same the units convey different information.
The term amu refers to the atomic mass unit which is the value of a proton and the value of a neutron in regards to a mass comparison to the standard that carbon - 12 has 6 protons and 6 neutrons.
When the designation for the the mass is
Let us look at an example of Carbon Dioxide -
The gram mass of of carbon dioxide
C = 1 x 12.01 = 12.01
O = 2 x 15.99 = 31.98
12.01 + 31.98 = 43.99 grams
This value can be designated as
However, if the unit is designated as amu the information informs us that there are 6 protons + 6 neutrons = 12 ma in carbon and 2(8 protons + 8 neutrons) = 32 amu in oxygen for a total of
44 amu in a