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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Definitions:

Virulence Evolution

The process by which the harmfulness or pathogenicity of an organism changes over time, often in response to host immunity or treatments.

Population Size

The number of individuals of a species living within a specific area or ecosystem at a given time.

High Density

A condition where individuals or objects are closely packed together in a given area, often leading to increased competition for resources.

Mutualisms Stability

Refers to the persistence and resilience of symbiotic interactions where both species benefit, despite environmental or evolutionary changes.