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Homework Help: Unit for Molar Mass(M)?

  1. Feb 28, 2010 #1
    Unit for Molar Mass(M)??

    1. The problem statement, all variables and given/known data
    What's the unit for Molar mass? Is it different in CHemistry and Physics?

    2. Relevant equations
    PV=nRT

    3. The attempt at a solution
    In Chemistry class(last year) I think I used (g/mol).
    But in Physics, my teacher says it's (kg/mol).
    What is right??
    THanks
     
  2. jcsd
  3. Feb 28, 2010 #2
    Re: Unit for Molar Mass(M)??

    In Physics, the SI unit for mass is the Kg. In chemistry, it usually is grams but it also depends on the type of questions you do and what S! unit the question asks for.
     
  4. Feb 28, 2010 #3

    ideasrule

    User Avatar
    Homework Helper

    Re: Unit for Molar Mass(M)??

    g/mol, kg/mol, slugs per mol, and (whatever other mass unit) per mol are all fine for both physics and chemistry. However, it may be more convenient to use a certain unit for certain calculations.
     
  5. Mar 1, 2010 #4

    Borek

    User Avatar

    Staff: Mentor

    Re: Unit for Molar Mass(M)??

    It is like asking which is a 'correct' pressure unit - PSI, atm or Pascal.
     
  6. Mar 1, 2010 #5
    Re: Unit for Molar Mass(M)??

    In your assignments and tests, use whichever you feel more comfortable with. Then just convert the answer to the units your teacher wants. There is no "correct" unit here, just your teacher's personal preference.

    If you are careful to always make sure your units check out and cancel properly, there should be no problem.
     
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