For the equilibrium
Br2(g) + Cl2(g) ⇋ 2BrCl(g),
the equilibrium constant Kp is 7.0 at 400 K. If a cylinder is charged with BrCl(g) at an initial pressure
of 1.00 atm and the system is allowed to come to equilibrium, what is the equilibrium partial
pressure of BrCl?