In: Other
Please note that in the question it is given that Space time = 120/ hr , but looking at the unit we can understant that the given quantity is actually space velocity and not space time.
[ unit of space time = (time)
unit of space velocity = (time-1) ]
Hence we have CA0 = 4 mol/L
k = 0.2 mol0.5/ L0.5 sec
space velocity, v = 120/hr = (120/3600) sec-1 = 0.03333 sec-1
space time
Now please see the images attached for the solution