A sample of gaseous nitrosyl bromide (NOBr) was placed in a container fitted with a frictionless, massless piston, where it decomposed at 25oC according to the following equation:
2NOBr(g) ⇌ 2NO(g) + Br2(g)
The initial density of the system was recorded as 4.495 g/ L. After equilibrium was reached, the density was noted to be 4.086 g/ L.
a. Determine the value of the equilibrium constant K for the reaction.
b. If Ar(g) is added to the system at equilibrium at constant temperature, what will happen to the equilibrium position? What happens to the value of K? Explain each answer.