14. A student thermally decomposed a 0.160 gram sample of impure potassium chlorate (KCIO3; 122.5 g/mole). Manganese dioxide (MnO2) was used as a catalyst. The student collected 45.00 mL of oxygen gas in a eudiometer over water. Potassium chloride is the other product of the reaction. At the time, the temperature was 22.22 °C and the atmospheric pressure was 771.00 mm Hg. The water level in the eudiometer was 7.00 cm above the water level in the beaker. The vapour pressure of water at this temperature is 18.11 mm Hg. [1 mm Hg 13.6 mm H2O; O2 = 32.00 g/mole; R = 0.082057 L Atm/mol K; PV = nRT; V1PIT2 = V2P2T1; 1 cm 10 mm; K = °C + 273.15] a] Write a balanced equation for the thermal decomposition of potassium chlorate: 2KC10 3 † MnOz -330, +2KCI b] Determine the volume, in mL, of the "dry" oxygen gas at STP conditions c] What is the percent purity of the potassium chlorate sample?

14. A student thermally decomposed a 0.160 gram sample of impure potassium chlorate (KCIO3; 122.5 g/mole). Manganese dioxide (MnO2) was used as a catalyst. The student collected 45.00 mL of oxygen gas in a eudiometer over water. Potassium chloride is the other product of the reaction. At the time, the temperature was 22.22 °C and the atmospheric pressure was 771.00 mm Hg. The water level in the eudiometer was 7.00 cm above the water level in the beaker. The vapour pressure of water at this temperature is 18.11 mm Hg. [1 mm Hg 13.6 mm H2O; O2 = 32.00 g/mole; R = 0.082057 L Atm/mol K; PV = nRT; V1PIT2 = V2P2T1; 1 cm 10 mm; K = °C + 273.15] a] Write a balanced equation for the thermal decomposition of potassium chlorate: 2KC10 3 † MnOz -330, +2KCI b] Determine the volume, in mL, of the "dry" oxygen gas at STP conditions c] What is the percent purity of the potassium chlorate sample?

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter5: Gases

Section: Chapter Questions

Problem 91QAP

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