MOLAR VOLUME OF A GAS DATA Before reaction: I O a. unknown number b. weight of b
ID: 537249 • Letter: M
Question
MOLAR VOLUME OF A GAS DATA Before reaction: I O a. unknown number b. weight of beaker, test tube c. weight of beaker, test tube, KCIO3 KCI d. weight of beaker, test tube, KCIO3 KCI, Mno2 e. weight of KCIO3 KCl sample (c-b) After reaction: volume of oxygen collected at laboratory temperature and pressure (determined by the amount of water expelled from the flask) 246.3 h g. temperature of the oxygen h. water vapor pressure at the measured temperature (table: Handbook of Chemistry and Physics) 150 mm H i barometric pressure 016 pressure of oxygen collected (i-h) k. weight of beaker, test tube, Mno2, residue l. weight of oxygen released during reaction (d -k) CALCULATIONS I. Using the following steps with the proper number of significant figures, calculate the molar volume of oxygen showing all work clearly. O lamol A. the moles of oxygen gas formed (use mass of gas from l) 3 q s 2 O Unol 32.0Explanation / Answer
II. 2KClO3 ---> 2KCl + 3O2
a. moles O2 formed = 0.0122 mol
b. moles KClO3 decomposed = 0.0122 x 2/3
= 0.0081 mol
c. grams of KClO3 decomposed = 0.0081 x 122.55 g/mol
= 0.993 g
d. % KClO3 in the original sample = 0.993 x 100/1.97
= 50.41%
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