1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Ideal Gas Law (mass)

  1. Dec 5, 2011 #1
    1. The problem statement, all variables and given/known data

    A fixed mass of oxygen (O2, molecular mass = 32 g/mol) is contained in a cylinder whose volume is 2.80 liters. The pressure is 148 atm when the temperature is 23oC. Find the mass of oxygen in the cylinder.

    a. 20 g
    b. 80 g
    c. 140 g
    d. 280 g
    e. 546 g

    2. Relevant equations

    m=n*molar mass

    3. The attempt at a solution

    n=0.17 moles

    m=n*molar mass

    and that is not a possible answer :s
  2. jcsd
  3. Dec 5, 2011 #2
    Units again!!!!!
  4. Dec 5, 2011 #3
    hehe thanks :s
    is the pressure supposed to be in Pa then??
  5. Dec 5, 2011 #4
    Has to be!!!!!!
  6. Dec 5, 2011 #5
    It's good to remeber that nearly everythig in thermodynamics has to be in energies which are in joules which are N*m
  7. Dec 5, 2011 #6
    thank you!! :)
  8. Dec 5, 2011 #7
    is the only wrong unit the pressure one??
    because now i am getting 558g
  9. Dec 5, 2011 #8
    you should have volume in m^3
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook