Final answer:
To convert 1650.3 µg/mL to µg/µL, one must recognize that 1 mL is equivalent to 1000 µL. Consequently, the concentration in µg/µL remains the same as in µg/mL, resulting in a value of 1650.3 µg/µL.
Step-by-step explanation:
Converting 1650.3 µg/mL to µg/µL is a straightforward process because both milliliters (mL) and microliters (µL) are units of volume in the metric system. One milliliter is equal to 1000 microliters, which is denoted by the ratio (10)-3L = 1 mL. Therefore, since the volume in both sides of the conversion is equivalent (1 mL = 1000 µL), the amount of substance does not change, and the concentration remains the same. The result is simply 1650.3 µg/µL, as the numeric value does not change during this particular conversion.