B)What is the mass (in kg) of an aspartame molecule?
There is some confusion regarding the definition of the atomic mass unit.
the definition is:
Unit of mass defined by the convention that the atom 12C has a mass of exactly 12 u; the mass of 1 u is 1.67^10-27 kg.
so the question you ask is then
Why then carbon mass is 12.011 and not 12? This because ...