[earthling77]

How do I find the mg/mL of a substance when given the molar mass if this sustance and the number of moles of it?

[Perito]

You also need the volume or the density, depending on the problem. You can't find concentration without some idea of the volume.

Molar mass (molecular weight) (grams/mole)

Number of moles (moles)

Density (grams/mL)



If you have the volume (for example, it's a solution), you can divide by that



If you have the density, you can calculate the volume occupied by the material:



Since you now know the mass (g) and the volume (mL), you simply divide them to get g/mL.