Could someone please help me with this problem? Samples of A (2.5 mol) and B (1.0 mol) are placed in a 5.0L container and the following reaction takes place: 2A(g) <--> B(g) + C(g) At equilibrium, the concentration of A is 0.20M. What is the value of Kc? Thanks. It's probably really simple but I can't seem to get it. I'm not that strong on this stuff. Also, apparently the relationship between Kc and Kp is Kc = Kp. Why is that the case? Thanks again.