eta 31.3 7a3 grams Weight of your empty Pyrex test tube Weight of KCLOs mixture

Question

eta 31.3 7a3 grams Weight of your empty Pyrex test tube Weight of KCLOs mixture and your test tube Mass of the unknown mixture of KCLOs (2-1 Weight of the unknown mixture, test tube with thoroughly miedcatalyst 32 g Weight of the unknown mixture, test tube and catalyst after heating2--265g 1. 2. ltou talyst 22 R0418 3 3847 4. 0-4241 5. Temperature of the gas produced 32.8 -aasas Kelvin 6. Volume of the gas collected 7, Barometer reading (uncorrected athme) y7:7 8. Corrected barometric pressure due to mercury expansion 9. vapor pressure of water at the temperature of the gas (from the table)-2-2 320 m , Qi.q mmHg 719,43 mm Hg mm Hg mm Hg Vanor pressure of the oxvzen collected (8-9)

Explanation / Answer

mass of KClO3 = 32.7841 - 31.3793 = 1.4048 g

mass loss by heating or mass of gas O2 = 32.8094 - 32.3847 = 0.4247g

Temperature = 22.8 + 273 = 295.8K

Volume of Gas = 334 mL = 0.334 L

Pressure = 749.98 mmHg - aqueous tension

         = 749.98 - 2.28 = 747.7 mmHg

1) mass of O2 = 0.4247 g

2) Partial pressure of Gas = 747.7 mmHg

3) we know PV = nRT

747.7/760 * 0.334 = n * 0.0821 * 295.8

n = number of moles of O2 = 0.0135

4) molecular weight of O2 = 0.4247g/0.0135mol = 31.4592 g/mol

difference in molecular weight = 31.998 - 31.4592 = 0.5388

percentage error = 0.5388/31.998 * 100 = 1.684 %

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