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A student forgot to add the reaction mix...

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

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A student forgot to add reaction mixture to round bottomed flask at 27^(@)C, but he placed the flask on the flame. After a lapse of time, he realised his mistake, using a pyrometer, he found the temperature of the flask was 477^(@)C. What fraction of the air would have been expelled out?

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