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Chemistry mol and grams

  1. Sep 3, 2009 #1
    1. The problem statement, all variables and given/known data
    How many grams are there in 6.80 moles of potassium sulfide? How many moles are there in 200g of barium nitride?

    2. Relevant equations

    I just want to see if i got the right answer

    3. The attempt at a solution
    for part A. i got 759g by multiplying 6.80x110.24(molar mass of K2S)

    part B. 0.455 mol by dividing 200?439.99(molar mass of Ba3N2)
     
  2. jcsd
  3. Sep 4, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    6.80*110.24 is not 759 :wink:

    But that's probably a typo.

    --
     
  4. Sep 6, 2009 #3
    From "Thermodynamics An Engineering Approach" by Cengel and Boles, "Molar mass can be defined as the mass of one mole of a substance in grams, or the mas of one kmol (kilogram-mole) in kilograms." then they go on to say "The mass of a system is equal to the product of it's molar mass M and mole number N."

    You should be able to get it on your own now.

    Thanks
    Matt
     
    Last edited: Sep 6, 2009
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