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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^@C` but instead he/she placed the flask on the flame . After a lapse of time, he realized his mistake, and using a pyrometer the found the temperature of the flask was `477^@C`. What fraction of air would have been expelled out?

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A student forgot to add the reaction mixture to the round bottomed flask at 27^@C but put it on the flame.After a lapse of time, he realized his mistake. Using a pyrometer he found the temperature of the flask was 477^@C fraction of air would have been expelled ?

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