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Homework Help: Calculating weight needed for micromole of solution

  1. Oct 22, 2014 #1
    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.
  2. jcsd
  3. Oct 22, 2014 #2


    User Avatar

    Staff: Mentor

    Start calculating how many grams you need, conversion from g to μg is rather trivial.
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