Verified answer

ug/mL x 1,000 mL/L x 1 umole/([molar mass] ug) = umol/L = uM

Notice how in conversion factor, the thing on top is worth the same as the thing on the bottom, and the units cancel to take you from where youa re to where you want to be.

It's just like dollars x 1£/1.55$ = pounds, that's all really

How do you convert µg/mL to µM

divide it by the molar mass and then multiply by 1000