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Posted by on Sunday, November 27, 2011 at 1:12pm.

I'm confused on this problem
A gaseous mixture inside a rigid steel vessel contains 75% CO2 and 25% H2O by volume at 175 degrees C and 225 kPa. The mixture is then cooled to 0 degrees C, thereby condensing the water vapor. What is the pressure of the CO2 at 0 degrees C? (assume that there is no water vapor present after condensation)
Please help me

  • Chemistry - , Sunday, November 27, 2011 at 1:42pm

    XCO2 = 0.75
    XH2O = 0.25
    PCO2 = XCO2*Ptotal
    PH2O = XH2O*Ptotal

    After the water condenses, the only gas left in the container is CO2 and it has changed T from 175 C to 0 C. Use
    (P1/T1) = (P2/T2) to calculate the new pressure at the new T.
    Post your work if you get stuck.

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