How do I convert mg to μmol?

Question

How do I convert 0.075mg into μmol?

Answer 1

To convert mg to umol, you need to know the molar mass (molecular weight).  For example, say the molar mass is 140 g/mole.  This is equal to 140 mg/mmole = 140 ug/umole, and so on.  For 0.075 mg you would have the following:

0.075 mg x 1000 ug/mg x 1 umol/140 ug = 0.536 umoles.

As you can see, YOU MUST KNOW THE MOLAR MASS to do these calculations.

EDIT: Just noticed you had glycine as a key word. The molar mass of glycine is 75.07 g/mol. Thus it is 75.07 ug/umol, and the calculation would be 0.075 mg x 1000 ug/mg x 1 umol/75.07 ug = 1 umole of glycine.