Finding Final Volume - almost got it

  1. Ok, here is what is given:

    1.00 mol O2
    Ti = 300K
    Vi = 5.00L
    4400 j of energy transfered by heat to the system
    Vf = ?
    Constant Pressure = 29.4 J/mol * K

    So I set the problem up using Q = n(Constant Pressure)(Tf - T-i)
    Solving for Tf I find that Tf is equal to 449.7K.

    Then using equation (Vf - Vi) = (nR(Tf - Ti)) / P

    Vf = ((1.00mol * 8.31 J/mol*K * 149.7K) / (1.013*10^5 N/m^2)) + 5.00L

    I am getting Vf = 17.28 L

    Can anyone tell me what I am doing wrong? My teacher told me the answer should be 7.52, could he of possibly meant 17.52?

    Any help would be appreciated!
  2. jcsd
  3. dextercioby

    dextercioby 12,328
    Science Advisor
    Homework Helper

    1.The teacher is right.
    2.The final temperature u computed is right...

    3.The formula u used is wrong...

  4. learningphysics

    learningphysics 4,120
    Homework Helper

    This is the specific heat capacity, not pressure.
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