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InterviewSolution
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5.9.8 gm KC103 is decomposed then weightloss was 0.384 gm. The percentage ofKCIo, decomposed is1. 10%3. 40%2. 20%4. 100% |
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Answer» The balanced chemical equation for this reaction can be written as:2KClO3(s) → 3O2(g) + 2KCl(s)2 x 122.5=245 2 x 74.5 =149As indicated above when 245 gram of KClO3reacts it produce 149 g of KCl.The weight loss during the reaction is 245 g - 149 g= 96 gNow we will find that how many gram of KClO3reacts to give the weight loss of 0.384 gram.96g of weight loss when KClO3is 245 gtherefore 0.384 gram of weight loss for KClO3will be = 245/96 x 0.384 = 0.98 g% of KClO3reacting or decompose = 0.98/4.9 x 100 = 20 % you are sure that second option is correct |
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