Chemistry Calculating % of KCLO3 in a Mixture

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To calculate the percentage of KCLO3 in the original mixture, first, determine the mass of KCLO3 that decomposed to produce KCL. The balanced equation for the decomposition of KCLO3 is 2 KCLO3 → 2 KCL + 3 O2. Given that the initial mass of the mixture is 12.00g and the final mass of KCL is 9.00g, the mass of KCLO3 can be found by subtracting the mass of KCL from the initial mass. The mass of KCLO3 is 12.00g - 9.00g = 3.00g. Therefore, the percentage of KCLO3 in the original mixture is (3.00g / 12.00g) * 100%, which equals 25%.
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I had this wuestion last week for homework and didnt get the answer because i was not at school today. Any help would be greatly appreciated

A 12.00g sample of a mixture of KCLO3 and KCL is heated until all the oxeyen has been removed from the sample. The product, entirely KCL, has a total mass of 9.00g. What is the percentage of KCLO3 in the orignal mixture?

(The 3 in KCLO3 is a subscript)
 
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Write out a balanced equation.
 
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