NAME SECTION MOLAR VOLUME OF A GAS DATA Before reaction: a. unknown number b wei
ID: 693285 • Letter: N
Question
NAME SECTION MOLAR VOLUME OF A GAS DATA Before reaction: a. unknown number b weight of beaker, test tube c. weight of beaker, test tube, KCIo-KC d. weight of beaker, test tube, KCIO3- KCL Mno2 e. weight of KCIO3-KCl sample (e-b) After reaction: f. volume of oxygen collected at laboratory temperature and pressure (determined by the amount of water expelled from the flask) & temperature of the oxygen h ater vapor pressure at the measurnd temperature (table: Handbook of Chemistry and Physics) i. barometric pressure j pressure of oxygen collected Gi-h) k. weight of beaker, test tube, Mno2, residue . weight of oxygen released during reaction (d-k) 14 1.113 CALCULATIONS I. Using the following steps with the proper number of significant figures, calculate the molar volume of oxygen showing all work clearly A. the moles of oxygen gas formed (use mass of gas from l) O.gwn 809 129Explanation / Answer
2 KClO3 (s) --> 2 KCl (s) + 3 O2 (g)
No. of moles of KClO3 decomposed = No. of moles of O2 formed * 2 / 3
= 0.011 * 2 / 3 = 0.007333
Grams of KClO3 in sample = Moles * MW = 0.007333 * 122.55
= 0.8987 g
% KClO3 in sample = 0.8987 g/ 3.49 g * 100
= 25.75 %
Refer below table:
II
Question
Weight
Volume
a)
No. of moles O2 formed
0.011
0.008036
b)
No. of moles of KClO3 decomposed
0.007333
0.005357
c)
Grams of KClO3 in sample
0.8987
0.6565
d)
% KClO3 in sample
25.75
18.81
II
Question
Weight
Volume
a)
No. of moles O2 formed
0.011
0.008036
b)
No. of moles of KClO3 decomposed
0.007333
0.005357
c)
Grams of KClO3 in sample
0.8987
0.6565
d)
% KClO3 in sample
25.75
18.81
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