Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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A mixture contains KClO3 and KCl. When the mixture is heated, only the KClO3 decomposes via the following reaction:

      2KClO3 (s) → 3O2 (g) + 2KCl (s)

In an experiment to determine the percent KClO3 in a KClO3/KCl mixture, the mixture was heated in a crucible several times in order to bring it to constant mass. The following experimental data was obtained.

Before Heating

      Mass empty crucible + lid = 20.61 g

      Mass crucible + lid+ KClO3/KCl mixture = 26.11 g

After Heating

      Mass crucible + lid+ contents (after final heating ) = 24.68 g

 

a) Mass KClO3 in mixture (stoichiometric calculation from the mass of oxygen evolved)

 

b) %KClO3 in mixture (g KClO3/g mixture then multiply by 100)

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