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Homework Help: A Gas is Compressed

  1. Oct 20, 2011 #1
    A sample of sulfur hexafluoride gas occupies a volume of 5.10 L at 198 C. Assuming that the pressure remains constant, what temperature (in C) is needed to reduce the volume to 2.50 L?

    I used PV/nRT = PV/nRT and got -42 C.

    Do I have to convert to Kevlin first and then back to Celsius?
  2. jcsd
  3. Oct 21, 2011 #2
    You would have to convert to Kelvin. Whether to express you answer in Celsius is a matter of prefrence, but your answer will come out in Kelvin.
  4. Oct 21, 2011 #3
    It looks like this is what you did already. You won't get -42 if you use initial temperature in Celsius.
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