A frequently used method for preparing oxygen in the laboratory is by the thermal decomposition of potassium chlorate according to the following unbalanced chemical equation: KClO 3 (s)→KCl(s) + O 2 (g) ; How many grams of O 2 (g) can be prepared from 30.6 g of KClO 3 (s)? (K=39, Cl=35.5, KClO 3 = 122.549g/mol )