Pre-lab Questions You heat 2.8594g of a sample mixture containing an unknown amount of potassius, chlorate (KClO3) in a crucible in the presence of MnO2 catalyst. Upon heating, the KClO3 in the mixture decomposes to produce oxygen gas and solid KCl. After the sample has cooled, you find the mass of the sample residue to be 2.1203g. 1. How many grams of oxygen gas were released during this reaction? 2. 8594gKClO3 2. How many moles of oxygen gas is this? 3. How many moles of KClO3 must have been in the original sample? You will need to write the balanced chemical reaction before you proceed with this calculation. 2. 4. How many grams of KClO3 must have been in the original sample? 5. What is the % of KClO3 in the original sample