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Ideal Gas Law problems

  1. Jan 21, 2013 #1
    1.A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 493cm^3 of air at atmospheric pressure (1.01*10^5 Pa) and a temperature of 27.0 degress celcius . At the end of the stroke, the air has been compressed to a volume of 47.0cm^3 and the gauge pressure has increased to 2.80*10^6 Pa .

    Q)Compute the final temperature in degrees celcius

    When I do this problem I change celcius to kelvins and set up the equation in the form T2=P2*V2*T1/(P1*T2) and get and answer of 792.8825337 which i then convert back into celcius for a total of 519.8825337 degrees celcius. I have tried that number 520 to no avail. I have no hints from mp, I am just told that I am wrong. Maybe I just need to sleep on it, but any help as to what my error is would be greatly appreciated.
  2. jcsd
  3. Jan 22, 2013 #2


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    What's the definition of gauge pressure?
  4. Jan 22, 2013 #3
    ... le sigh. Thanks.
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