Question

Percentage of Oxygen in Potassium Chlorate Introduction: The thermal decomposition of potassium chlorate can be described by the following equation: 2 KCIO3(s) 2 KCls) + 3 O2(g) Egn 1 (D stands for heating, elevated temperature) In this experiment you will determine the percentage of oxygen in potassium chlorate. You will compare the experimental result with the theoretical percentage calculated from the formula KCIO3. While potassium chlorate decomposes simply by heating, the reaction is very slow. A catalyst is used. Catalyst is a substance, material, admixture that accelerate the reaction, while not being consumed in that reaction and remained chemically unchanged. In this case, manganese (IV) oxide, MnO2, is used as a catalyst. Although the catalyst contains oxygen, the catalyst does not undergo any chemical change and does not contribute to the oxygen release by the potassium chlorate. As with any catalyst, the amount of catalyst at the beginning will be the same as at the end of the reaction. The experimental procedure is to weigh a quantity of potassium chlorate, heat it to drive off the oxygen, and then weigh the residue, which is known to be potassium chloride. The loss in mass represents the oxygen content of the original potassium chlorate. The above procedure will be carried out in a glass test tube For the nurnose of weight measurements the

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(1 KClO2 may be explosive if this is divided into very small particle, it means Koloz is explusive, so koida have this type of potential sowice ,laboratory accident in ith this experiment KCl 03 when contact with My son, it catches fire, so you avoid to touch or contad with My Soup & Also not heat to much long time in fine. KCIO3 also can explosive if it mix with Why salt 8o avoid to mix... If your accident occur, then put i off gas surner or heater Discard mixture in planty of water is in the sand. Or y use fire-extinguisher.com @ 2 Aga Os heat, AAgos? + Oz (9 @ The starting mass of Ago is - Mass of crucible + Ayyu) - mass of crucible i: 38.6239.- 30-2969 = 8.327 y OR The starting mass of Agao is = 8.327 g (6 The mass of oxygen released Mass of (coucible Thig o) – Mass of (caucible + conto aty after decompo - 886237 38.06ly 1 = 0.562 g - Sihon

© Experimental percentage of oxygen in Ago o from the data in Mays of 02 x 100 = 0-5628 X100 1. Mass of initial Ago 8.3218 10% in Agzo = 6.749% - Talomated & Theoretical percentage of oxygen in Agzo from the formula. 2 Ag₂O (8) B 4 Ag (6) + O2 (as Criven Mass 8.3219 0.57458 Molecular - 231. 735g/mol 16.0 g/mol plass weight Mole 2x 0.035933 285 mol = 0.07186657 mel 0.03593328Sme) Calculated from reaction 2 mole of Ag20 give 1 mole of a or 0.07 186657 mole of Ag20 give 0-035933285mote mote of of oz. Hence theoretical mile of On is = 0.035933285mol. or Theoretical mass of Oz is molect az x mclocitlar I weight of a 2 0.03593285 mol x Boss 16-09 The oritical mass of O₂ = 0.5749 g

e Percentage = error (Theovehical Mars - Experimental mas)x100 - Theoretical Mass 2.244% - (0.57493 - 0-5623) x 100 = 0.5749g | Percentage error = 2.244x.)