A Mixture of KCl and KClO₃ Weighing 1 $2 \mathrm { KClO } _ { 3 } ( s ) \rightarrow 2 \mathrm { KCl } ( s ) + 3 \mathrm { O } _ { 2 } ( g )$

question 79

Multiple Choice

A mixture of KCl and KClO₃ weighing 1.65 grams was heated; the dry O₂ generated occupied 143 mL at STP. What percent by mass of the original mixture was KClO₃, which decomposes as follows:
$2 \mathrm { KClO } _ { 3 } ( s ) \rightarrow 2 \mathrm { KCl } ( s ) + 3 \mathrm { O } _ { 2 } ( g )$

• A) 31.6%
• B) 47.4%
• C) 71.1%
• D) 8.67%
• E) 19.2%

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