Oxygen can be generated by the thermal decomposition of potassium chlorate, desc

Question

Oxygen can be generated by the thermal decomposition of potassium chlorate, described by the following equation. 2 KClO_3(s) 2KCl(s) + 3 O_2(g) A student carried out this reaction in a eudiometer in hopes of measuring the Ideal Gas Law Constant, R. The gas collected in the eudiometer displaced water (just like in your experiment). She allowed the reaction to proceed for 10 minutes and collected the following data: Does she have enough data to determine R? Explain. If she has enough information, find R. If she does not have enough information, make a good estimate of any missing information and estimate R

Explanation / Answer

a) No, the data is insufficient for her to calculate R, the pressure of the gas in the eudiometer has to be known
sinc R = PV / nT

b) V = 48.25 mL = 0.04825 L
mass of KClO3used up in the reaction = 200 mg - 47 mg = 153 mg = 0.153 gm
n = (0.153 gm / 122.55 gm/mol) = 1.24847*10-3 mol
T = 33 + 273.15 = 306.15 K
estimated P = 0.66 atm
estimated R = (0.66 atm * 0.04825 L) / (1.24847*10-3 mol * 306.15K) = 0.08331 L atm mol-1K-1
   

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