Final answer:
The mysterious white powder could be any of the substances listed, including powdered sugar, cocaine, codeine, norfenefrine, or fructose.
Step-by-step explanation:
The mysterious white powder could be any of the substances listed, including powdered sugar C12H22O11, cocaine C17H21NO4, codeine C18H21NO3, norfenefrine C8H11NO2, or fructose C6H12O6.