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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. What fraction of air would have been expelled out? 

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Let the volume of the round bottomed flask be V. 

Then, the volume of air inside the flask at 27° C is V. 


V1 = V 

T1 = 27°C = 300 K 

V2 =? 

T2 = 477° C = 750 K 

According to Charles’s law, 

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