21 mM to mol/L

21 mM = 0.021 mol/L

mMmol/L
15 mM0.015
17 mM0.017
19 mM0.019
210.021
23 mM0.023
25 mM0.025
27 mM0.027

21 mM = 0.021 mol/L

Formula

1 mol/L = 1,000 mM (millimolar) · 1 mM = 0.001 mol/L