Is this correct? A molar conversion for NAD+ at 50 micromolar concentration

[Peterz]

Homework Statement

Convert 50 micromolar NAD+ to ng/ml

Relevant Equations

I mole NAD+ = 660 grams
1 micromolar = 1 micromole/L
1,000,000,000 nanograms/gm

660 grams/mole for NAD+
50 micromolar is 0.00005 mole/L
0.00005 mole/L x 660 gm/mole = 0.033 gm/L
1,000,000,000 ng/gm x 0.033 gm/L = 33,000,000 ng/L
33,000,000 ng/L x 1L/1000ml = 33,000 ng/ml Is this correct?

 

[Borek]

looks OK to me