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  • A student forgot to add the reaction mixture to the round bottomed flask at 27 °C but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 °C.

5.11     A student forgot to add the reaction mixture to the round bottomed flask at 27 °C but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 °C. What fraction of air would have been expelled out?

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best_answer

Assume the round-bottomed flask has volume = V\ cm^3

so, the volume of air in the flask at 27^{\circ}C = V\ cm^3.

To find out how much air has been expelled out, we use Charle's Law:

\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}

Therefore Volume\ expelled = 2.5V-V =1.5V

Or, Fraction of air expelled =\frac{1.5V}{2.5V} =\frac{3}{5}
 

 

Posted by

Divya Prakash Singh

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