Question

You have a mixture of KClO3 and KCl and you want to determine the % KClO3 in the mixture. The mixture weighs 1 gram. You heat the mixture strongly, cool it, and re-weigh. Now the mixture weighs 0.8 grams. What was the % KClO3 assuming all the weight loss was due to the loss of oxygen from the KClO3? 2 KClO3 + KCl --> 3 KCl + 3 O2

Answer 1

akceo 3 + kce zace + 302 mass loss during Heating & Initial mass- final mass inor = 1- 0.8= 0.2g mass of Ora 0.2g molar mass of de zzginal e molis ojos moderne mass moles of O2 = 6.25 x10 moles 2 moles of cloz forums 3 moles of O2 for 6.25 X 10 moles of O2 a number of moles of acco; uequired a les = = 2 x 6.25 X 10 3 Hoon = 40167 X 10 -3 moles. mass of acloz = moles x molar mass keloz T - 4.167 X 10 3 X 122-55 = 0.519 Total mass of mitive = 1g % keloz = 0.51 x 100 1 % KClO₂ = 54%