A Mixture of KCl and KClO₃ Weighing 1

question 37

Multiple Choice

A mixture of KCl and KClO₃ weighing 1.80 g was heated; the dry O₂ generated occupied 1.40  10² mL at STP. What percent of the original mixture was KClO₃? KClO₃ decomposes as follows: 2KClO₃(s)  2KCl(s) + 3O₂(g)

• A) 37.2%
• B) 72.6%
• C) 42.6%
• D) 63.8%
• E) 28.4%

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