A student forgot to add the reaction mixture to the round bottomed open flask at `27^(@) C` and 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` What fraction of air would have been expelled out ? .

Answer

`(3)/(5)`

Explanation

`(V_(1))/(T_(1))=(V_(2))/(T_(2))`
`T_(1)=273+27=300K`
`T_(2)=273+477=750K`
`(V_(1))/(V_(2))=(300)/(750)=(2)/(5)`
`"Fraction of air expelled"=1-(2)/(5)=(3)/(5)`.