2 NOBr(8) ► 2 NO(g) + Br2(8) 12. The equation above represents an elementary step in a chemical reaction. Which of the following is the correct expression for the rate law of the elementary step? 1 (A) Rate = k[NOBr]2 (B) Rate = k[NOBr] (C) Rate = k[NOBr)? (D) Rate = k[NO]?[Brz] =