The equilibrium constant for this system is 8.5 × 10³. If the equilibrium concentration of NH₃ is 9.2 × 10² M, what is the equilibrium concentration of H₂S?
a. 9.2 × 10² M
b. 7.8 × 10⁴ M
c. 1.0 M
d. 1.1 × 10¹ M