How many molecules are in 5 mg of aspartame?
We're asked to find the number of molecules of a given mass of a substance. We can do this using the molar mass of the substance and Avogadro's constant,
Aspartame has the chemical formula
Let's convert the given mass (
Using Avogadro's constant, we can convert this value to molecules as so:
which I'll leave at one significant figure, as allowed by the problem..