# Molecular weight of aspartame

Question: The artificial sweetener NutraSweet is a chemical called aspartame (C14 H18 N2 O5).

A) What is its molecular mass (in atomic units)?

B)What is the mass (in kg) of an aspartame molecule?

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#### Solution Preview

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 ...

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