3 vols. of oxygen requires KClO3 = 2 vols.
So, 1 vols. of oxygen will require KClO3 =
So, 33.6 litres of oxygen will require KClO3 = 2/3 * 33.6 =22.4Litre
22.4 litres of KClO3 has mass = 1mole=122.5 g
Thereofore weight of KClO3 required to produce 33.6 litres of O2 = 122.5g