Question

phsophorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to

PCl3 (g) +Cl2 (g)->PCl5 (g) Kc = 2.01 at 500k

If a 1.000L reaction vessel is charged with .300 mol of PCl5(g) and allowed to equilibrate at this temperature, what would be the partical pressure of PCl5(g)



please help need this to study for a test tomorrow. I know I have to use the ice table in there somewhere but that is about it.

Answer 1

First, it is phosphorus trichloride and pentachloride. Second you probably meant partial pressure.

..........PCl3 + Cl2 ==> PCl5
I..........0......0.......0.300
c..........x......x........-x
E..........x......x.......0.0300-x

Substitute the E line into the kc expression ad solve for x and evaluate 0.300-x.