The decomposition of NOBR is studied manometrically because the number of moles of gas changes; it cannot be studied colorimetrically because both NOBR and Br, are reddish-brown. 2NOBr(g) 2NO(g ) + Brzg) Use the data below to make the following determinations: (1) the average rate over the entire experiment. (b) the average rate between 2.00 and 4.00 s. Time (s) [NOB1] (mol/L) 0.00 0.0100 2.00 0.0071 4.00 0.0055 6.00 0.0045 8.00 0.0038 10.00 0.0033 The rates of decomposition of NOBR are (a) mol L (b) mol L,1 5.