Decomposition of potassium chlorate open paren KClO sub 3 close paren produces potassium chloride KCl and pure oxygen open paren cap o sub 2 close paren according to this balanced equation. 2 KCIO sub 3 s rightarrow 2 KCl s plus 3 cap o sub 2 g What volume of oxygen gas is released at STP if 10 point 0 g of potassium chlorate is decomposed? (The molar mass of KClO sub 3 is 122 point 5 5 g over mol )