Final answer:
The mass of Roman coins in a museum is typically recorded in grams (c).
Step-by-step explanation:
The mass of Roman coins in a museum would typically be recorded in grams (c).
The standard unit of mass in the International System of Units (SI) is the kilogram (kg). However, for smaller objects like coins, the more appropriate unit of measurement is grams, which is equal to 1/1000 of a kilogram.
So, when measuring the masses of Roman coins, it would be most common and practical to use grams as the unit of measurement.