[AdamBOMBB]

Okay So I have not been able to understand what I have done wrong in this problem.  There are 2 problems, 1 which is at standard temperature 298 K which I got correct and the other problem is @ 1200 K.  The picture cuts off its "Using data from Appendix C in the textbook, calculate the equilibrium pressure of CO2  at 1200 K" The problem is as follows:






I found the H to equal 269.3 kJ and S = .1719, with Delta G of 0 from the back of the book = -394.4 for CO2(g)... I keep getting around 1.6 x 10^-4 atm's. Any suggestions to what I'm doing wrong? I just did the same formula as the first problem except used 1200 Kelvin. Thanks in advance.

[Borek]

Have you tried to use one significant digit as requested?

[AdamBOMBB]

Yes I have tried 1, 2 and 3 x 10^-4.  So theres an error in my calculations. Does anyone get a different number than that?