Which is a better unit for expressing molar mass, amu or grams/mole?

Question

Avery Adams · Accepted Answer

Although the numerical values are identical, the units represent distinct information. In terms of mass comparison to the standard that carbon-12 has six protons and six neutrons, the term "amu" refers to the atomic mass unit, which is the value of a proton and the value of a neutron. When the designation for the the mass is #(grams)/(mol)# the unit refers to the fact that in 1 mole of a substance there is a specific gram amount. Let us look at an example of Carbon Dioxide - #CO_2# The gram mass of of carbon dioxide #CO_2# can be determined by combining the mass of one carbon atom and 2 oxygen atoms.  O = 2 x 15.99 = 31.98 C = 1 x 12.01 = 12.01 12.01 plus 31.98 equals 43.99 grams. This value can be designated as #(grams)/(mol)# meaning that in one mole (#(6.02 x 10^23)# molecules) there would be 43.99 grams of #CO_2#. 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 #CO_2#.

Luna Chen · Answer

undefined Since grams/mole directly corresponds to the mass of one mole of a substance, it is a more convenient unit of measurement for expressing molar mass and facilitates comparisons and calculations between different substances.