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Homework Help: Find the Number of Moles

  1. Mar 25, 2010 #1
    1. The problem statement, all variables and given/known data
    Gas is contained in an 7.71 liter vessel at a temperature of 18.6oC and a pressure of 8.35 atm. Determine the number of moles of gas in the vessel.


    2. Relevant equations

    1 mol= 6.03 x 10^23

    # of moles= mass of the gas/molecular mass

    3. The attempt at a solution

    I converted Liters to grams, which would make it 7,710 grams, but I'm not sure how to find the molecular mass of the gas, when just given the temperature and the pressure.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 25, 2010 #2
    welcome to PF!

    Right now you have a volume, a temperature, and a pressure, and you want to find number of moles. is it possible that you are overseeing a formula?
     
  4. Mar 25, 2010 #3
    oh, the Ideal gas law!
     
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