Calculate the theoretical % oxygen in the potassium chlorate sample. Calculate t

Question

Calculate the theoretical % oxygen in the potassium chlorate sample. Calculate the % error in your experimental % oxygen determination. If you had forgotten to read the label on the jar carefully and put potassium chloride in the crucible instead of potassium chlorate, how would your results have been affected? (a) If your sample of potassium chlorate was contaminated with potassium chloride, how would your % oxygen change? (b) How, specifically, might this error occur in the lab? (a) If some of your potassium chlorate popped out of the crucible while you were heating it, how would your % oxygen have been affected? (b) What systematic error might a student have done to cause this to happen? In Part B, what observations did you make that led you to believe your residue was potassium chloride? Explain fully for credit. A student hasn't properly washed her test tubes (1-3) used for Part B of Experiment 6 and they are with sodium chloride (NaCl). How will this negatively affect her results for this portion of the lab?

Explanation / Answer

4. Equations: 2 KClO3 (s) --> 2 KCl (s) + 3O2 (g)

The theoretical % of oxygen = 3 (molar mass of oxygen)/Molar mass of KClO3 X 100

= 96/245.2 X 100

= 39.15%

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