Difference between molecular mass and molar mass

  1. 1. The problem statement, all variables and given/known data

    What is the difference between molecular mass and molar mass? Are they related?

    2. Relevant equations

    moles = total mass/ mass/mole

    3. The attempt at a solution

    I can't find any explanation in my lecture notes.
    I think that:
    molecular mass = mass of one molecule
    molar mass = mass of one mole of a molecule

    I think they are related by if i took the molecular mass and multiplied it by the number of moles, I would get the molar mass.
    Any help explaining these concepts is appreciated!
  2. jcsd
  3. Borek

    Staff: Mentor

    Correct, but in what units?

    Correct, but in what units?

    I guess you mean "number of molecules in a mole", not "number of moles". You are not wrong, but you are still missing one important factor. Again, think about units used for both molar and molecular mass.
    gracy likes this.
  4. Is molar mass not the same thing as mass of one mole of the substance in question?
  5. Borek

    Staff: Mentor

    Yes it is.

    But without using correct units you will be still off.
  6. If that is the case the unit will be gram per mole i.e gmol-1. How about that?
    Is relative molecular mass the same as molecular mass?
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