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April 19, 2014

Homework Help: Chem II

Posted by Ken on Monday, June 16, 2008 at 9:48pm.

The equilibrium constant, Kp for the reaction PCl5 <---> PCl3 + Cl2 is 1.05 at 250 degrees C. The reaction is started with PCl5, PCL3 and Cl2 at 0.177, 0.223, and 0.111 atm at 250 degrees C. When the reaction comes to equilibrium, the pressure of _________

PCl3 must have decreased
Cl2 must have decreased
PCl5 must have decreased
PCl5 must have increased

I am not sure how to do this problem. I have tried subing 1.05 into the Kp formula and leaving one of the pressures out, but the answers that I would get when plugged back into the formula would not give 1.05 as an answer

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