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Homework Help: How to do a T vs Q Diagram?

  1. Jul 28, 2012 #1
    1. The problem statement, all variables and given/known data
    Carbon dioxide (CO2) is an interesting substance. It has no liquid phase at normal pressure; it sublimates rather than melts, going directly from the solid form (dry ice) to a vapor. This sublimation occurs at -78.5°C with a latent heat of sublimation (similar to a heat of vaporization) of 573,100 J/kg. Draw the phase diagram (T vs. Q) for a 1kg sample of carbon dioxide that covers the temperature range from -125°C to -25°C.

    3. The attempt at a solution
    I've seen T vs P diagrams, and P vs V diagrams, but I have no idea how to construct a T vs Q diagram. I have to work off of the fact that Q in this case refers to the amount of heat required to raise the temperature, but I'm not sure how to go about doing that. Help please?
  2. jcsd
  3. Jul 28, 2012 #2
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