Now consider the following reaction and data: \rm H_2 + 2BrCl \rightarrow 2HCl + Br_2 Time (\rm s) \rm Br_2 concentration (M) 5 1.23 15 1.56 Part B What is the average rate of formation of \rm Br_2? Express your answer to three decimal places and include the appropriate units. What is the average rate of formation of \rm Br_2?