Hydrofluoric Acid Is Used in the Preparation of Numerous Pharmaceuticals

Hydrofluoric acid is used in the preparation of numerous pharmaceuticals (e.g., Prozac) and industrial materials (e.g., Teflon) . It can be produced by the reaction of hydrogen and fluorine gases. Starting with initial concentrations of 2.00 M for H₂ and 2.00 M for F₂, what would be the equilibrium concentration of HF? The equilibrium constant for the reaction K_c = 115.

A) 0.85 M
B) 1.69 M
C) 2.85 M
D) 3.37 M
E) 4.00 M