Spray pyrolysis uses much higher temperatures than spray drying, such that precursors\ are directly converted to product upon drying and calcination. In the preparation of ZnO particles,\ a solution containing 0.1 M of zinc acetate (Zn(COOCH3) 2) is sprayed using a nozzle to produce\ droplets 40 \\\\mu m in diameter. Upon pyrolysis, zinc acetate is converted to ZnO with a 1:1 molar\ conversion ratio and the ZnO particles are 50 v% dense. What is the diameter of the ZnO particles?\ The theoretical density of ZnO is 5.606 g/cm 3