A sample of BrF at 300 K with an internal pressure of 0.743 atm decomposes into Br2(g)
and BrF3(g). At equilibrium, the partial pressure of BrF has decreased by 0.201 atm.
Determine the equilibrium constant, Kp. (Answer 2.8 × 10–2)
I have been doing this but i get a different result, so i would like a bit of help
Thanks