Consider the Reaction 2NH₃(g) → N₂(g) + 3H₂(g)

Consider the reaction 2NH₃(g) → N₂(g) + 3H₂(g)
If the rate Δ[H₂]/Δt is 0.030 mol L^-1 • s^-1, what is Δ[NH₃]/Δt?

A) -0.045 mol L^-1• s^-1
B) -0.030 mol L^-1• s^-1
C) -0.020 mol L^-1• s^-1
D) -0.010 mol L^-1• s^-1
E) None of these choices is correct.