Question

what unit is the molar mass typically expressed in?
grams per mole (g/mol)
grams
moles per gram
moles

Explanation:

Molar mass is defined as the mass of one mole of a substance. By definition, it is calculated as mass (in grams) divided by the amount of substance (in moles). So the unit is grams per mole ($g/mol$). Grams ($g$) is just a unit of mass, moles ($mol$) is just a unit of amount of substance, and moles per gram ($mol/g$) is the reciprocal of molar mass which is not the typical unit for molar mass.

Answer:

grams per mole ($g/mol$)