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Homework Help: Physics question here help please.Is my solution correct?

  1. Nov 21, 2012 #1
    A moster of a gas has 4 moles and first is in the temperature 300 K and pressure 10 atmosphere.After a change of state, ∆T= -50 K and ∆V=10 liter.Find the final temperature ,volume and pressure of the gas.

    2. Relevant equations


    3. The attempt at a solution
    So T2-T1=-50 <=> T2=300-50=250 K
    Now,to find V2, I thought : Find V1 first and then do V2-V1=∆V. From pv=nRT where T =300,pressure is 10 and the moles are 4. I Find that V1=997.2 here I replace V2-997.2=10 but V2 isnt the same as in my textbook..what did I do wrong
  2. jcsd
  3. Nov 21, 2012 #2


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    Staff: Mentor

    Try to work with units, this could help. I don't think V1=997.2 liters, and if it is something else you cannot simply add 10 to the numerical value.
  4. Nov 21, 2012 #3
    Take a look again at your pressure... It is 10 atmospheres not just 10. You will end up with a much smaller value for volume
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