The equilibrium constant, K, for the following reaction is 1.20E-2 at 500 K. PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) An equilibrium mixture of the three gases in a 1.00 L flask at 500 K contains 0.171 M PCl₅, 4.53E-2.
A) 0.058 M
B) 0.089 M
C) 0.171 M
D) 0.213 M