concentrations of B ana Lat . reverse steps given that the forward step is first-order in A, and the reverse step is first-onts for the forward and Question 4 For the reaction 2HI(g)H2(g)+I2(g) at 283C and a concentration of 1M, the number of molecules of hydrogen iodine colliding per second is 61031 per cm3. The activation energy of the reaction is 187kJ. Calculate the number of molecules reacting per cm3