This is a closed book/notes exan Question 8 Calculate the rate of change of the concentration of COMPOUND X (in mol/L's) during the period 20 seconds to 45.0 seconds Time (s) COMPOUND X (mol/L) 43.77 0 15.0 13.96 20.0 1.57 45.0 0.20 60.0 0.17 75.0 0.12 90.0 0.085