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Homework Help: Ideal Gas HW Problem?

  1. Jul 2, 2013 #1
    Ideal Gas HW Problem!?

    1. The problem statement, all variables and given/known data
    "At an altitude of 11,000 meters, the air temperature is -50 degrees celsius. The air density is 0.403 kg/m^3. What is the pressure of the atmosphere at that altitude."

    2. Relevant equations
    P = P0exp(- Mgy/RT)

    3. The attempt at a solution
    I attempted to solve the problem using the above equation above equation and my result was P = 2.8 * 10^4. However my online homework is not accepting the answer and I'm not sure what I did wrong. Any help would be greatly appreciated!
  2. jcsd
  3. Jul 2, 2013 #2


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    Homework Helper

    Po is the pressure at altitude h=0, at the given temperature. I think you used the value given for T=273 K.

    Use the Ideal Gas Law instead.

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