Consider the Reaction 2NOBr(g) 2NO(g) + Br₂(g)

Consider the reaction 2NOBr(g) 2NO(g) + Br₂(g)
A 1) 0-L vessel was initially filled with pure NOBr at a pressure of 3.8 atm and 300 K. At equilibrium, the partial pressure of NOBr was 2.0 atm. Determine the value of K_p for the reaction.

A) 1.6
B) 1.4
C) 0.81
D) 0.73
E) 0.90