1. The problem statement, all variables and given/known data Here is the question: What weight of neutral red (molecular weight 289) must be dissolved in 1.00 ml to give a =40.0 µM (µmol l-1) solution? Give your answer in MICROGRAMS (µg). 2. Relevant equations Not sure the only one I'm aware of is mole concentration (mol dm^-3) = moles/volume but I can't seem to find the answer using this. 3. The attempt at a solution i. I understand that moles dm^-3 = moles/volume but this is in Micrograms so I am a bit confused.