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September 23, 2014

Homework Help: Chemistry

Posted by Sam on Saturday, December 1, 2012 at 12:11am.

You are given 2.677 g of a mixture of KClO3 and KCl. When heated, the KClO3 decomposes to KCl
and O2,
2 KClO3 (s) → 2 KCl (s) + 3 O2 (g),
and 605 mL of O2 is collected over water at 28 C. The total pressure of the gases in the collection flask is
763 mm Hg. What is the weight percentage of KClO3 in the sample?
The formula weight of KClO3 is 122.55 g/mol. The vapor pressure of water at 28 C is 28.3 mm Hg

(763-28.3)(0.605)/(0.0821)....help?

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